The perpetual and unfailing insanity ("i") of females of all ages, races, creeds, colors, religions, sexual orientations, and other dispositional differentiators, without exception.
"Man, 100% of girls are just crazy. Every last one of them, I swear."

"Dealin' with some of that i-factor lately?"
by Pete Calleri February 8, 2008
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The I factor is the same thing as the Y-Factor but pertaining to "i". The amount of "i"s in the word Hi shows the level of drunkenness or affection.
Hi (1) = normal
Hii (2) = good friends
Hiii (3) = I like you/ Lets date
Hiiii (4) = lets fuck
Hiiiii (5 or more) = Drunk
1) Hi, whats up?
2) Hii, did you want to go downtown?
3) Hiii how are you doing baby?
4) Hiiii my roommate's gone, wanna come over?
5) Hiiiii im trashed right now!!!
This is the I-Factor
by BIGGBOIIJOHN July 7, 2019
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Competitive party game. Each player takes it in turn to play the cheesiest/biggest tracks from their iPod/phone. Winner is the person with largest portion of booty shaken and/or most raucous screeching. Best played intoxicated.
"Oh man, this party's so borrring"
"What we need is a good dose of I-factor!"
(whoop whoop)
by Wammycat August 27, 2013
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