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(Plural-monopuses, not monopi!)

1. An octopus with only one tentacle, also known as an eel. Not to be confused with a polypus, which is an octopus or any multi-tentacled animal. Monopuses are known for coming after people who do bad things.

2. Being too close to someone else in a drill move for marching band.
The monopuses are going to come get you!

Monopus! Monopus!
by DoroNinjaChan August 20, 2011
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2
An octopus but mono it only has one tentacle it's basically just one of my nightmares.
OH GOOOD IT WAS AN MONOPUS OH thank God it was a nightmare
by Danksoul March 25, 2019
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