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1.
An onomatopoetic phrase stated out loud when one has a boner.

Typically, the second 'bump' is stated with higher inflection, and the volume of the phrase is representative on how raging the boner is.

The phrase can also be used in general situations of extreme happiness.
After seeing a tall blonde girl with huge tits walk past you while sitting on the park bench with a couple of buddies: "bump bump"

"Hey bro, I just saw that hot ging at that party, and I totally bump bumped."

"Tiger Woods just won the tournament, our douchebag varsity golf roommate Patrick probably just bump bumped."
by balbir December 06, 2011
 
2.
The phonetic representation of the feeling one gets when falling in love with a girl. The word is used an outburst, or a pet name to a loved one. It should not be used to label the feeling, only to express that one is feeling it.

(Saying bump-bump should sound like a heartbeat from a delicate voice.)
Person 1: I was just looking into your eyes and, bump-bump, I think I fell in love with you more deeply!

Person 2: Oh lord! You're mushy!
by Bump-Bump October 28, 2010