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1.
a guy that cums a lot and likes everyone to know that he does.
girl: "look who's coming down the hall!"

girl 2: "It's Sir.Cumsalot!"
by jjeer September 25, 2011
 
2.
Jordan's penis.
Samii, have you seen Sir Cums Alot latly, he misses you.
by SamiiiiamS August 12, 2008