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A hippo that has ceased to be hip.

Word used to describe anything that thinks it's cool, but isn't or anything that was once cool, but isn't anymore due to arrogance or a changing of the times.
Pachelbel the Panther: See Herbie over there? Think he all fly 'n shit, yawning like he don't give a fuck 'bout whether he gets mauled by Leo. He one straight opotamus.
Andy the Aardvark: Yeah, man. Think he all badass 'n cool, when he really just a bigass, lazy mo'fucka.

Hungry Hippos are the opposite of opotamus.

Bell bottoms are opotamus.
Related Words

Opotmiyon 

An incredibly terrible take. Something so completely idiotic to say, you will be publicly shamed after uttering it. Maybe even worse. Some people are proud of opotmiyons, they are losers and deserve to be fonked behind the local Subway.
Idiot: Big Floppa is dumb!
Reasonable person: shut the fuck up
Idiot: You can’t bully me for having an opotmiyon!
Reasonable person 2: alright, let’s take him to the local Subway
Opotmiyon by eeeehg October 2, 2020

J.A.P.opotamus 

Jewish American Princess to the 10th power. A Jewish female who is bitchy, spoiled, gold-digging, greedy, complicated, self-righteous, overbearing, selfish and high maintenance in the absolute extreme.
Don: Holy shit, Saul is marring a fucking J.A.P.

Harry: No man. He's marrying a fucking J.A.P.opotamus.
J.A.P.opotamus by Jesus J.A.P. February 19, 2011
a really fucking cool thing that we should all hail but got no fucking clue what it is but still yes praying opota yes
everyone: all hail the wonderful opota
opota by opota October 7, 2020

[fag-opotimus]

That sow isn't a lesbian, she is a "fag-opotimus"!!!
[fag-opotimus] by Ikeenan December 9, 2008

opotomas 

a word to put on the end of words to make it seem awsome
negropotomas,bonerpotomas,dickopotomas,etc..
opotomas by howdy neighbor1 June 12, 2011