look up any word, like sex:
 
1.
It's a girl with large, but amazingly beautiful booty
That rumpadump is completely swallowing your g-string
by rannyran March 29, 2010
 
2.
To deposit a large amount of excrement in a toliet while straining to the point of hemorrhage.
I ran to the bathroom because i had to rump-a-dump!
by Phatazz August 07, 2003
 
3.
taking a dump on a sleeping persons face
the friends rumpadumped on his father
by Zth The Wild thang October 15, 2006