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1.
Loud bass on your misic; when your beats is all the way up an the bass makes the rear veiw mirrors vibrate and shit falls down.
by Whodat March 06, 2005
 
2.
When you are on a sport boat that has water balists filled up to creat a wake to surf on. The boat appears to be sinking and lays low in the water its "slumpin"
We were at the lake slumpin and surfing all weekend long.
by Willber DCC November 05, 2010
 
3.
low down and funky, but knee deep enough to ride to.
slumpin' beats and phat tracks as we spin da wax...
by Boomer December 09, 1999
 
4.
sumtin but bigger or more of it.
I got i lil sumpin slumpin up my sleeve
translation: i got some thing big up my sleeve
by DA DA March 18, 2004