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1. A cigarette induced bowel movment of immediate importance.
"Excuse me, I think this Marlboro is bringin on a smump."
by scbrix September 22, 2006
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2
Highly offensive term; most offensive term known to man. Worse than calling someone a C**t.

If you look up in Oxfrd Dictionary wll find a picture of Joseph Morgan Lewis, 30th May 1991, Newport, Wales.
Emma: OH MY GOD Joe, you are such a smump!!

Joe: EMMA! You are the smumpiest smump EVER!!
by DickheadDickhead December 01, 2009
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3
To kiss
#1- guess what!?

#2- omg what!?

#1- i totally got smumped out last night! i swear it was the time of mah life :
by XAgentxCupcakeX May 19, 2009
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