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simply the lardass whales name spelled backwards. however, the actual name of the large fish is officially spelled with a "u" versus two "o's", but it just looks and sounds better. otherwise the correct spelling is: shamu with an accent over the u. also, this can be used for someones name or nickname
Joe: "hey oomahs, how are you today"
OOMAHS: "Hey jackass, im doin pretty good myself, hows the family?"
Joe: "pretty good"
OOMAHS by Shittabum July 24, 2008
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oomaharumooma 

An exclamation of extreme emotion or a spiritual aid. Used in Henry Miller's Tropic of Cancer.
oomaharumooma! oomaharumooma! oomaharumooma!
oomaharumooma by Lizzie Simon June 11, 2006
Related Words
I hang with some ootahs
Ootahs by 2trappy717 July 19, 2021

Oompahstor 

Someone who poses as a tuba player, but has no idea how to play the instrument.
Did you see that brass band? They must have had twenty sousaphone players!”

“It’s just for show. Nearly half of them are oompahstors.”
Oompahstor by Bad Beth and Beyond September 30, 2021
Humanoid creatures from the oomans
An Ooman is a creature from the Oomans not a human
Oomans by MaskedmanDef August 12, 2022
It’s a weird word. Just like you.
Person 1: You’re so weird.. You’re a Oomahosp.
Person 2: Bro what
Oomahosp by D0G0N0G January 24, 2025