this term is used, somewhat either neutrally or sarcastically, to define a ridiculous idea or ideas that are far off ridiculous, even by the standards of most people's imagination.
boy: my teacher would look good in a Frankenstein suit for Halloween, so I'll usurp Harry Potter's magic powers, and turn him into one for ever. I don't like that teacher anyways. No need for even a costume

boy's mother: Honey, please stop living underwater. If you think your teacher is so ugly, ask him if he is related to Boris Karloff, who was the best portrayer of Frankenstein in film, or just note in your diary that you personally think your teacher looks like Frankenstein. No need to do anything radical.
by Sexydimma February 3, 2012
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Underwater Archery is the act of masterbating while submerged under water. It can be in a pool, bath or even ocean.
"Dude, that guy just jerked off in the pool!"
"It's called Underwater Archery."
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by SteynUD September 6, 2016
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To be a "tiger underwater" means to be really, really angry (or "super-pissed"). Taken from the actual event of a tiger being underwater. Upon searching "tigers underwater" on Google images, you will find that every single tiger underwater is abnormally upset with everything around it.
Ways to use it include:
"Dude I'm a tiger underwater right now"

"Yeah, he's being a tiger underwater"

"Dude, quit being a tiger underwater".

"You know, If I was just playing GTA4 because I was bored and I got the Red Ring of Death, I would have been pissed. However, I got the Red Ring when I was about to play a game I've been waiting months to play, so you could say I'm a tiger underwater."
by Staska June 14, 2009
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an underwater blowfish is when you fuck a girl so hard and u take your sweat put it in a cup, stick your dick in the cup, have the girl suck your dick so it tastes like salt water and the ocean water..hense underwater...
underwater blowfish
by snacky pack December 12, 2010
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underwater cum : the diaphanous squirts and threads of a guy's cumgasm underwater when he's jacking off in the bathtub or in a swimming pool.
I'm always amazed at the amount of underwater cum there is after I blow my load in the pool!
by USAF Cadet January 5, 2021
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Describes the action of an individual that is not fleet footed. Especially when pertaining to sports, when an athlete is slow.
"Smitty takes so long to get to first base, its like he's running underwater!"
by sheeet October 26, 2008
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the act of cupping one's hand over you butthole in the shower and letting the water run down your back and collect in your hand, then farting thus making a loud funny noise.
"i committed an Underwater Holocaust in the shower this morning, and it was so loud that my mom heard it and yelled at me. Heehee"
by toni pepporonni November 19, 2011
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