2 definitions by jumbonian

when a newly-married person (usually female) gains 15 lbs soon after the wedding--often not working out and eating too much. similar term is "freshman 15" for first year college students.
- omg, have you seen Katie's ass lately?

- oh yeah, she's put on the marriage 15.
by jumbonian February 23, 2011
short form for "calm your monkey ass down" or simply for "calm down"
Girlfriend: Tell me why you came home late last night, RIGHT NOW.
Boyfriend: Monkey down, I'll tell you later.
by jumbonian July 04, 2010

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