Verb: To pay a bro back with a similar gesture with no specific deadline, whenever is most convenient.
1: When your buddy J-Bowks spots you tickets for a movie and agrees to let you pay for whenever next time you guys go to the movies.
2: When your buddy Willy Poo spots you a fatty
in exchange for another whenever you happen to get one.
TD:"Fuck man I'm broke as dicks, spot me a (enter desired object/interaction here) (giggity)."
JB:"Yeah its cool man just broback me whenever."
TD:"Sweet man. Thanks dude I owe you."
JB:"Damn right you do."