Not to be confused with brosis which is an infectious disease.
Last night my bro-sis had a party at which she wore a polo shirt, drank beer from a red plastic cup, and shouted "WHOOOO" loudly several times.
Common symptoms are thinking you're rad, clowning on everyone else, refering to everyone as 'bro', and always talking smack about bitches and getting laid.
There's way too much brosis in that crew for me to handle.
Leave your brosis at home and come have fun with us.
"It ain't no bro; it ain't no sista; it's'a brosis, brosis!"
Man: "Dude, man, brosis, that ass is 'hella dank'. I'd hit it like an abusive husband."
Response from woman or subject of unknown gender: "Fuck you, pig! But I appreciate the fact that you did not call me bro, my bro."