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!"
A "definitely not gay" gay sexual activity between two bros wherein a man stands over a second man who is kneeling while both parties are nude. The first man then takes his genitalia in his hand like a hammer and uses it to beat on the second man's forehead, as though he were a nail, until the first man reaches climax. This activity comes with the unspoken rule that the bros never make eye contact, lest the activity becomes homosexual in nature.
Bro 1: "Thanks bro I feel so much better"
Bro 2: "Anytime bro, I'm always down when you need a Brohamer.