1. A pirate's treasure that once belonged to a large beast of some sort. Usually these large beasts would would go by the name of Shug Night or Big Poppa. They would battle eachother using only rhyming words, but then resort to guns when a feeling of insupieriority would around within them. If one survived, they would collect the other's booty, to later become instict, and have their treasure become of high demand.

2. A woman's large ass. This ass is not proportionate to the rest of their body, much like the head of a midget. Some would also call this a "Bubble Butt". That term is now obsolete.
Pirate says: "arrrrr, look er dat der bubble butt, no, tis better den a bubble butt, tis a Monster Booty! Walk da plank Woman!"
"yo son, I wanna tap dat Monster Booty
It be lookin so sweet n goody
she so ghetto dat she wears a hoody
but she look so dang moody"
by FancyHancy February 8, 2008
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when a human being shakes their ass so fast and furious it causes the ground to ripple instead of their ass.
did you see big bertha break that house down with that monsterous booty shake
by walden8starz July 11, 2008
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a man whos need for 'the booty' transforms him into a snarling, drooling, uncontrolable booty monster. the only cure, is for the booty monsters prey to give it up.
kelly says no so often that her boyfriend has with-drawls and turns into the booty monster. then theres no stopping him.
by jizzie bean August 11, 2010
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someone who is obsessed with the booty. they will grab it at any means necessary and won't hesitate to chomp on it at any second.
"you're such a booty monster" my boyfriend said to me as i violently attacked his rear end.
by therealpussyqueen June 21, 2022
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a fruity booty monster is somebody who is fruity for booty
"that man Sam Smith is a fruity booty monster."
by llibertyy7 January 24, 2019
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