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1.
An acronym for "I fucking hate her." Slang tossed around by high school students when words can't describe the violence and hatred they feel towards the school slut, whore, bitch, etc. when they do something particularly disgusting, get a new STD, or make an attempt to get into your boyfriend's pants. There is no better form of revenge than to create an official IFHH group in your school.
Chey: Emilie, I slept with this 50 year old and I think I might be pregnant. So now I'm all paranoid and I keep hitting myself in the stomach. Shit, shit, shit.

Emilie: Maybe if you pee, the sperm will come out. It works that way, right?

Molli: Shut the fuck up. No one wants to hear it. God, IFHH.
by NiiChii September 10, 2010
 
2.
object worthy of lust and sexual desire, as in "I'd do him"; acronym for "I'd fuck him hard"
Did I mention how hot he is? IFHH.
by JTurbo75 June 28, 2010