When a girl or guy tell someone they're crazy about that they are done fighting with them, and fighting for them.
Done usually after the other person gets into a serious relationship with someone else.
Guy : "I'm Dating Kristen."
Girl : "Omfg, I'm donefighting for you!"
Guy : "Wow, Now you're just Brookin It."
to brooke it - i.e. to voraciously perform fellatio on a hopelessly flaccid member.
brooke it, brookin', brooked
"she brooked it"
"she didnt just suck my dick, she tried to perform cpr on it - straight brooking it"
"i donno if this is gonna happen baby, my dick is brooken"
"i drank 10 beers and did coke baby, it's brookin"
brooke