when you have known someone of the same sex for many years and do sexual favors for eachother, without feeling gay about it. for males it's usually sucking eachother or jerking eachtother off. to help not feel gay about this, try watching porn while they suck or jerk you. for women, usually they use dildos or finger or lick eachother. once again, use porn to help.
guy 1: hey you want to go down to your basement and do a little something something?
guy 2: i guess so, let me just grab my ipod.
guy 1: why?
guy 2: so i can watch this milf suck this guys dick POV so i dont feel gay.
guy 1: good idea.
guy 1 is a bi-friend-fucker.