Bump bummer 

Individual who hangs around only to bum a bump from a person

Frank hangs out with Jane only to be a bump bummer not a real friend.

Bump bummer by simplybeauitful December 15, 2019

bumper-bump 

When a person is going so slow the only thing you can do to resolve it is tap their bumper with yours a bit.

That fucker is going so slow

Give him a bumper-bump

Good idea *tap*

Hey! He started moving.

bumper-bump by Donkey Kong dige November 29, 2013

Bumber-bee-bump 

A game in which contestants take turns naming the state on the northeast border of the state in which they live. If no state exists on the northeast border they must shout “Bumber-bee-bump” and move to a new state. The game is most commonly played online by hobos and tramps using public computers in libraries and coffee shops. Suggestions that players shout "Bumble-bee-bump" are based on rumors propagated by the uninformed.

"Hey, let's play a game of bumber-bee-bump."

Bumber-bee-bump by Xtpd September 15, 2009