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A mom who is also a dormant volcano just taking everyday as it comes without venting or speaking her mind. But somewhere deep inside she feels it coming, the day when she’ll flip out and explode, spewing lava all over the school hallways. Until that day she just smiles.
Carol seems so controlled but you know she's a momcano about to erupt.
Related Words

Momcation 

(n.) 1. A break from one's motherly duties 2. Extended periods of time that one's children spend with their father, usually as a result of a custody agreement. Used to denote only a respite from day to day parental activities not normal duties (i.e. work, household, etc.)
The kids are spending two weeks this summer with their father - what should I do with my momcation?
Momcation by SusMFS June 15, 2009
Two different meanings:

A: Some gadgetry in Halo 3 that throws a player either high up or far out into the distance, only to be sniped, skeet shot, or a battle rifle massage in the back when he or she lands.

B: A bunch of jocks that take a scrawny or morbidly obese high school student, one holds each arm, then they sling the 'ammo' into a crowd or another scrawny kid or morbidly obese person at terminal velocity. Side effects to mancannoning someone can include, but is not limited to, temporary paralysis, permanent paralysis, eating concrete or other terrain, fractures, sprains, death, fights, embarrassment, disciplinary action, and commonly, unexpected gas.
A: LOLOLZ I MANCANNOND AND LANDED ON A TRIPINE IT WENT BOOM HEADSHOT FTW LOLFFFFFF.

B: I mancannoned Ned into fatty just now. It was funny until we found out he had to get his face reconstructed in plastic surgery.
Mancannon by Pr1nc3 A1b3rt February 18, 2008

momcation 

Moms that go on vacation without their kids
My daughter asked me why i was going away 4 nights with just my best friends and I yelled I need a MOMCATION!
momcation by mm10 February 1, 2012

Muscannon 

An individual who believes in the bullshit claim that a musket is a small cannon. He/she has never heard of a trigger or a fuse in his/her life.
"a musket is a small cannon"
"Fuckin muscannon, shut the fuck up"
Muscannon by RightOpinion October 8, 2019