bro backer

When you understand that your little brother is horny but frustrated alot and tired of masterbating all the time. You provide him with a girl to fuck and get a blowjob from.

Numerous times after I hear sex noises going on, my little brother will come out of his bedroom naked except for a little towel around his waist. He then says to me, "dude, thanks for being not only a bro backer but also a good brother. The girl you got me is a freak! She said she wants to rim me, suck my toes and drain my balls again."