clam bumping 

the act of to women (lesbians or bi) having sex by bumping there vagina's against eachother.

dude, i caught my ex and my mom clam bumping last night

clam bumping by juneaus November 6, 2004

dumper bumping

Dirty anal sex. It was first pioneered by the Gap Tooth Pirate, Cromer. Before ejaculation, the man pulls out and cums on the girl's face, because "she knew it was coming".

Cromer and Tiffany were dumper bumping in the locked room. I knew because of the grunts of pain from Tiffany and the stink of bunghole and sweat.

dumper bumping by Captain Crunkbeard August 18, 2006

Bumped your head 

You thought wrong

(Very common in the California Prison System, & on the streets)

John can you loan me some money

You bumped your head, no way am I going to loan you any money.

Bumped your head by Kconnor56 July 1, 2010

Bumper butt 

It's a butt that is is very big and attractive were you wanna hit it. Like in bumper cars you wanna hit the other people.

My boyfriend has a bumper butt

Bumper butt by Gpnfa July 10, 2014

Bumper Nipples 

When two topless women are rubbing thier breats against one another.

"I love watching hot lesbians play bumper nipples."

Bumper Nipples by HotDyke July 31, 2006

Bumper Boating

The act of docking without a foreskin

Simon went Bumper Boating with Chris because they were unable to dock.

Bumper Boating by El Capitan! July 6, 2009

bumpin' 

1. A term used for music when played at a high volume.

2. A complimentary adjective.

"Yo dude that new stereo system of yours is bumpin'!"

bumpin' by LynZ Malakian May 7, 2004