slappin

playing music that has alot of bass.

when yo trunk knockin hard

Turning up a listening device extrememly loud

When one plays music with a lot of bass and slang, roles down the windows, and turns the speakers on blast so all the BITCHES can hear.

an equivalent of dope, awesome, delicious. Usually used for food, a dish can be "slappin" like it's so good that if someone disputes its awesome godliness they are in for a slappin.
Can also be used in the form of a verb to describe something's slappy awesomeness.

reference to a cool item of clothing, somthing that someone has done that is particularly sound, or anything you want it to mean. it comes from the BENglo-Saxon word 'Slah-pin' which means "cradle of the dusty rat".

usually meaning good or delicious