A Bro is a guy who wairs his hat curled up and sideways. He drives a huge lifted truck and works out constantly... but only on his biceps. he is probably wairing a black famous shirt to cover his beer belly from drinking too much out in the desert.
Someone who does good stuff for you in the hopes that one might be suddenly endowed with all the wealth and generosity that you could possibly give (and usually are disappointed)
MAC: Dude, that guy gave you a brand-new Mini Cooper S with supercharger and NOS intake apertures?!
BILL: Man, what a suck-up, I know. He just wants me to let him date my sister. Like that'll ever happen, HA! But nice car anyway, so thanks to him!