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IBA is an acronym standing for Intellectual Badass. A euphemistic alternative to "nerd." However, an IBA has the ability to be reasonably smart and extremely cool at the same time.
A: "I love science... I'm such a nerd."

B: "You are NOT a nerd. You're an intellectual badass... get it right."

A: "Oh give it a rest IBA."
by The_SS_IBA set sail January 19, 2011
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2
IBA stand for I'd Buck Anything meaning that you would have sexual intercourse with anything be it man women plant or animal
Are you an IBA??
Of course I fucked that fat ugly bird over there last night!!YEOO!!!
by McKeatDawg April 22, 2008
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Stands for: Infected By Association

When a guy or girl is so sketchy, sleazy or nasty that you feel infected or disgusted by just being around them.

Can apply to someone who is not actually sleazy but appears to be.
Did you see her? Major IBA!

She sat beside me in math class. IBA to the max!

I felt IBA around him, he's so dirty
by Pooface 91 February 09, 2011
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Itchy-Burny-Ass. Irritation of the asshole, usually associated with eating ethnic foods.
I can not figure it out... Ever since I have had the iba, my hand as smelled like shit.
by Logan Earth Ski November 02, 2005
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5
Internet Bad Ass Syndrome. A severe syndrome plaguing all video games where nerdy users can act tough towards other people, when in fact could get choked out by a 5-year old.
Nerd: You guys got pwned, I bet I can kick your ass in real life
Guy: This nerd has a serious case of IBAS
Guy 1: yes he does, its a very serious epidemic
Nerd: fuck you guys, give me your address
by B Rad Gesus December 18, 2009
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6
abbreviation for insecure bitch attack. used for times when you feel insecure or self conscious. some people have iba's more than most, although everybody has had one
god my thighs are so huge
no they aren't
i'm so fat
no you're not, you are just having an i.b.a

by m.e.l-9 March 24, 2009
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