Top Definition
A term referring to the day of the week; Monday. Over emphasizing the disdain for this particular day.
Darn I have a test on Mongay!

Tyrone owes me money! If he ain't paying I'm gonna slap his ass back to Mongay!
by MlKE HAVVK July 07, 2014
1 more definition
a poor slang term for a party - involving the consumption of alcohol, along with the participation in wholesome activities, i.e. boardgames, knitting, etc.
Do you want to come over to my house for a mongay? or ... Hey, let's have a mongay on Monday.
by FiddleFaddler January 17, 2011

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