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It is essentially the countious process of MULTIPLE male participants ejeculating or so-called "cumming" into the same female (most commonly the vagina, mouth, or anus). The name comes from the reference to a shack as an often dirty dwelling which can be virtually used by almost anyone (hence the implication of a whore).
Sally is such a hoe! I bet she wouldn't mind becoming the school cum shack!!
cum shack by Maxxx 90703562 April 20, 2008
Related Words

Cum shack that

the absolute best pick-up line you can use when you see a TOTALLY THICC KWEEN WITH A BIG BOOTAY (male or female)
Barbara: "HEY RON, CUM SHACK THAT ON ME WILLY"

Ron: "well barbara, you honestly are the uglyest woman i have ever seen a i know about your pucci cooties , but you have such a way with words. Yes, yes i will shack that for you hunni ass"

cum sack 

Someone who holds cum in some place in there body; I.E. Butthole, mouth, vagina etc.

A person who is a fucking bastard.
cum sack by Rporter February 25, 2008

Cum Sack 

"Look at the cum sack on that gal."
Cum Sack by Moose August 30, 2004

Sack of Cum 

An expresion showing anger and hate toward a complete retard or just a dumb person.
Let me take a hit -Joey
No you "sack of cum"-Andrew

Jenny hurry up i need to Jerk off - Bill
What the fuck ill take my time you "sack of cum"-Jenny
Sack of Cum by Maurimcfluuu June 28, 2016