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1.
place for unwanted semen (woman)

see also:
cunt, vagina, twat, minge etc
by Anonymous July 17, 2003
 
2.
A person or specific body part which acts as a receptor for cum.
Three men used my ass as a spunk dump in the bath house last night.
by bigbear May 21, 2004
 
3.
A woman (or man!) makes herself 'available' to one or two men from a group friends and all they other men find out and also manage to nail her, repeatedly, taking her total of your group into double figures.
' That girl you went home with the other night you do know she has slept with a couple of your mates?', 'Yeah I do she is the football teams Spunk Dump!'
by Oinoisy4 June 17, 2009