What is Mantrum?
1.
when a grown man throws a tantrum when he can't have his way.
Rick had a mantrum when he found out he couldn't have McDonald's for dinner
See
2.
Being irrational and angry for no reason, and throwing a male tantrum...as only a man can.
John couldn't lift his television by himself, so he threw a mantrum and then the TV into the dumpster.
See
3.
A man having a tantrum or a sizable fit over a minor thing. "Man"-"Tantrum"
Server #1:"Dude you need to chill man...."
Angry Guy: " FUCK YOU I TOLD U I WANTED A LATTE MACHIATTO WITH THREE SHOTS OF ESPRESSO!!! NOT TWO!!!! YOU BASTARD!!! ARE YOU FUCKING PLAYING WITH MY HEAD?!?!?!?
Guy: "Whoa, what's gotten him in a mantrum..."
See
4.
A long, boring drawn out expression of rage the human male expresses when he notices that life and the world didn't give him what he deserves, such as the perfect career, car, life, etc. Sometimes starts as young as 25, generally crops up when the late 30s are reached - either expressed in annoying (to women) outbursts of rage and self-pity or (equally annoying to women) a red convertible.
See: making an ass of oneself.
"When Ronnie reached the age of 45, he realized that he wasn't going to be a rock star genius super hero fireman with six pack abs and thick, curly hair, so after raging at the people around him for what he didn't have instead of appreciating what he did have (a paid for house, a dog that loved him, a wife and kids who worshiped him, and an IRA), Ronnie threw a mantrum: he divorced his wife, bought an expensive toupee, a corset, a red sports car, and a barely legal blonde."
See