a fart that rolls up your crack resulting in what feels to be a slap on the bottom of your back.
I hate sitting on a desk cause it gives me unda thunda.
by puhgoodle December 29, 2006
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Unda Oafh is the ridiculous facial expression that boxers, Boston terriers and pugs have with their African American lazy eyes and flat wide noses. Unda Oafh was a phrased by OJ Simpson when he was sworn in during his testimony, showing his very Afro-American featured and glazed over lazy eyes.
Bro 1: WTF IS WRONG WITH THAT DOG??? HE IS LOOKING IN TWO DIRECTIONS!!!!

Bro 2: Aww shit man, he just unda oafh.
by Mega Hemroids August 13, 2019
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Unda gang is a group of pricks who think they are all bad. Their ring leader is Hasan Naqvi, the most stupid of the lot.
Harry: you know i got beaten up.
Harry's older brother in college: by who?
Harry: i think you know...they think that they are the baddest on the block.
Harry's older brother in college:Unda gang! IM GONNA FUCK THEM UP AND EAT THEM FOR BREAKFAST.
by NotYourUsualGuy May 13, 2020
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The combination of smells and substance that accumulates "from under" you private parts when in need of shower.
George grabbed a quick shower to wash his fum-unda before his date.
by sb400 November 13, 2007
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Five N Unda it’s like the dollar store but it’s not!
Old lady: I gotta tall you about this new store my grandson told me about! It’s called five n Unda it’s like the dollar store but it’s not! I’d kill for five n Unda I’d sell my soul for it!
Man: Ma’am this is a subway
by MichaelMellonaid September 16, 2019
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A testicular flocking of curdled cheese and organic matter that lies dormant from unda a clammy man’s ball sack
As soon as Frankie hopped inside Moe’s Jeep Cherokee, the scent of man really kicked in as I identified his signature essence from unda cheese through his gum shorts..oooh weee
by Roobeer September 28, 2020
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