An individual, usually someone who couldn't find anyone else to live with, that takes up space, makes noise when you are trying to sleep, and walks in on you while you are masturbating. Luckily the roommate will typically not find it too strange if you just stay under the covers looking annoyed until he/she leaves.
Roommate: Hi! I didn't know you were up.
Pants-less Me: Um... I'm not....
1) An individual with an abnormally small penis or acts like a small penis.
2) A penis that is both abnormally small in width and length. It is typically considered to be a penis that is 4 inches or less in length and very thin.
3) The act of sex in which one partner can not please the other and the second partner must find a way to amuse him/herself. Partner one is typically a male, while partner two can be either a male or a female. This experience can transcend species.
Girl 1: So how was your date with that guy last night?
Girl 2: *sigh* He has an Ian.
Girl 1: Lulz. You always get stuck with Ians.
Boy 1: I CAN'T STAND THAT GUY!
Girl 3: Yea, he is such an Ian!
Boy 2: Did you watch animal planet last night?
Boy 3: Lol. Yea. That zebra was just continued grazzin' while she got Ianed.