when your making out with a chick and then you put your face in there bare and or covered tits.
michael is making out with kt. then he titty bumps (verb. titty bumping) her and she smiles.
by david Williams January 24, 2007
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1. a system that turns the ordinary mundane party into the extra kickthefuckass armerica party
2. im not sure but it gets girls wet
hot girl one- "yo bitch lets head over to betas, they have a bumpin sound system"
hot girl two - "oh fuck yea im wet just thinkin about it"
by MREIGN October 9, 2009
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Females engaging in mutual stimulation between by grinding their vulvas together (for those less technical, vulva=pussy mound and all that is within)
The Pussy Hound thought he was scoring with 2 chicks until he realized they were pussy bumpin' sisters.
by banana pepper eatin' minx June 20, 2006
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1. The act of putting small coins, such as pennys and dimes, in the cup holders on car doors so that when the bass is turned up all the way on the car stero, the change rattles or is "Bumpin'.

2. A way of judging the "legitness" of a rap song's bass, if the change rattles than it is considered a legit song and should be enjoyed at a very high level.
"wow man, listen to that change, its bumpin' "
"You'd think Jay-Z would try to make his songs more legit by making them rattle more change, so they would be Change Bumpers"

Examples of Change Bumpin' Songs:

A Milli by lil Wayne
Bombs Over Baghdad by Outkast
Fuck tha Police by N.W.A.
No Tears by Scarface
Forgot About DRE by Dr. Dre ft Eminem
Because I Got High by Afroman

This is just a list of examples of Change Bumpin' music, there is a seemingly endless amount out there. Other songs can be considered Change Bumpin' with a vote of 3 or more people, and has to have majority vote or it is not considered to be a Change Bumper
by Change Bumpers 101 September 28, 2009
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Something really phat. Like a car with a system so loud that the car is bumping out of its frame.
Yo, that new Common song is so hot, it's bumpin out the frame.
by Jessica Demster April 29, 2003
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Talking a lot of mess that when you need to just shut up.
Why you bumpin yo lips for if you ain't got shit to say
by Elizabeth2004 October 23, 2006
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