By this I mean the kind of insult someone would have to work out to be insulted by it, something to do with the technical parts of maths or science or whatever. (Kinda like a jokes in XKCD)

Mine, although not too insulting, is calling someone Arsenic Sulphur. In the periodic table of elements the atomic symbol of these, in that order, spell out ass!

If you have one please explain it.

You Mudkip.

You Dastardedly, pencil sniffer.

You exsquisitly idiotic corken meisser.

Looks like someone uses Intelligence as a dump stat.

You're such a Windows Vista!!!

Yeah, I went there.

Shut up, Puke Skywalker.
...do we need more posts in this thread?

Hey you, Goomba chew!

OR

Hello there, hypotenuse-face!

OR

Sorry, but isn't that spot reserved? It says "Pwnd noobs parking only"!

01011001011011110111010100100000011000010111001001100101001000000111001101110101011000110
11010000010000001100001001000000110100101100100011010010110111101110100001000010010000001
001100011011110110110000100000001000010010000001001100011011110110110000100001

Hee hee....

"You're so stupid, there are more stars in the universe than links between your brain-cells."

For those of you who don't know, an average human brain has more links between it's cells than all the stars that we currently know of. In order to get beneath that number, a person would need to have a brain the size of a dog's or smaller.

sky14kemea:
"You're so dumb you probably think Pi is exactly THREE!"

-___- I am not good at insults.

Well I thought it was a bit funny..

OT:Anyways, my insults have no relevance. My charisma level isn't high enough :(

Rounds on me!
wait a second aww thats something someone cool would say
Nearly there

!F U canz R^@d +H!$ U R^@||y n^^D 2 G^+ L@!D

yeah how about that.

And if not F^.^ you.

Punisher A.J.:
!F U canz R^@d +H!$ U R^@||y n^^D 2 G^+ L@!D

Yes. Yes i do. We all do.

dududf:
01011001011011110111010100100000011000010111001001100101001000000111001101110101011000110
11010000010000001100001001000000110100101100100011010010110111101110100001000010010000001
001100011011110110110000100000001000010010000001001100011011110110110000100001

Hee hee....

Oh man, that's so low. That's not an insult..that's just...horrible. :P

"If you were a metal, you'd be sodium"

"You act like you have an IQ of 0000010"

"Any competent mind shouldn't have to rely on crassities and obscenities to win an argument. Your rebuttal?"

Guess what comes next. NOTE: this only works on inarticulate people.

You have NO LIFE! your undead

Adding your intelligence modifier to your d20 roll... you come out at -57.

The sewer rat bests you at tic tac toe.

when someone swears at you:

Obscenities are the adjective for the mentally deficient.

Your parents really should have re-rolled, huh?

"Wow,your so slow,is your ping at 999?"

Your momma thinks square roots are vegetables!

Amethyst Wind:
Your parents really should have re-rolled, huh?

Brilliant.

Ill make one up.

Your so ugly, you make Princess Theradas look hot. (I think thats her name)

I once said to someone, "Man you'd never get laid even if you had fluorine as your wingman."

Explanation: Fluorine is the most electronegative element on the periodic table. As such, it is the most "attractive" to electrons. The rationale is that this dude I was referring to was so ugly he couldn't even get overflow electrons i.e. the B-line chicks that would roll off a hunk like fluorine.

Ooh that was nerdy.

Youre as much use as Toad!

When I or one of my friends do something clumsy, we "botch[ed] our DEX check." Similarly with having a blond moment (failed out INT checks) or getting hungover (failed our FORT save).

RPQ:
"Your so dumb you probably think Masterchief is American"

Now that is really funny! lawl!

reyttm4:
By this I mean the kind of insult someone would have to work out to be insulted by it, something to do with the technical parts of maths or science or whatever. (Kinda like a jokes in XKCD)

Mine, although not too insulting, is calling someone Arsenic Sulphur. In the periodic table of elements the atomic symbol of these, in that order, spell out ass!

If you have one please explain it.

Or Arsenic Selenium if you want to go all British!

You're the Gnome to my Tauren!