Pretend to be in love in order to fuck a chick, and then dump her right away! Don't TELL her, just DISAPPEAR!
A person who DOES the hump-n-dump is called "Humpty Dumpty".
The act of having sex and then breaking up with that chick/dude immediately afterward.
Hey dude, you totally pulled a hump n dump last night with that chick! Right on brah!
The act of hit and run
A one night stand
That Joe gave the ho the ole HunpNdump
When you have sex with a girl (or boy) and then run to the bathroom to unload a large duce
dude I just humpndumped a girl last night and totally clogged her toilet
Dropping a deuce after sex.
Melly, I'll brb. I have to take a hump 'n dump.