When a friend gets into a relationship and begins to not hang out with one of his guy friends as much as he did before said relationship. Friend spends most of his time with his girlfriend and not other friends. In other words: Anti-Bros before Hoes
Friend: Hey, why haven't you been hanging with John much anymore?
You: John got a girlfriend so he hangs with her all the time.
A self-explanatory portmanteau of bro and betrayer, first conceived when this question impregnated the shacknews forums: "This place is full of intellects of the highest order so I come to you looking for a metaphor for 'someone who continually fucks you over but you still remain their friend. all end of the spectrums are open for your personal creativity.'"
"Dude, I've been Josh's friend since college began and he just came down and snagged my natty ice! This after he admitted to making out with my girlfriend! Fuck, this is madness! What a brotayer!"
When you've been betrayed by your bro
As in sleeping with your girl, shaking up your beer, faking a high five, or not acknowledging your play with an ass slap
"Dude, my bro slept with my girl"
"Aw man bro, you've been hella brotrayed"