This is when you are totally into whatever it is your doing! so you say damn im hella into it, and your friend dimon will say "i dont get it whats into it??
You are doing something and one asks you if you are i2i and then you say HELL YES IM I2I!
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi