Top Definition
The Day after easter when everyone who has given up sex or jacken it for lent gives into their carnal urges and has a lot of fun all by themselves
DudeBro 1 "Dude..Bro why weren't you at work Monday."

DudeBro 2 "Dude it was Cum Monday, I was reintroducing my right hand.... to myself"

DudeBro 1 "WEEEERD Brah I forgot about Cum Monday"

DudeBro 2 "Better get to work we only have 15 minutes left on our lunch break."
by Sean Bradley June 06, 2007
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