When a friend gives another friend an erection, but it's okay because it's purely platonic and doesn't mean anything.
"Dude Avy just sent me her tits and I got the most insane boner. But it's harmless because we're just friends-- it's a friend boner!"
by BaronO'Malley March 12, 2018
An erection that occurs when a person has a bunch friends come and hang out or do activities. Therefore the person gets an exasperating boner.
NOT GAY AT ALL!
NOT GAY AT ALL!
by teddycakes January 30, 2012
It is a non-sexual comment directed at your friend for an action he/she performed that was totally awesome.
by gigglybutviolent January 30, 2004
when you see someone you want to be friends with because they are interesting, attractive, or otherwise fly
by friendbonerfiend November 5, 2010