When the piss you've stored in your urinary bladder starts going sicko mode and it gets harder and harder to move due to the pain, just like your dick when you get a boner.
Chad: The liquids in my body are moving everywhere! It hurts so much agh lemme sit down fam.
Derek: Ya homie lie down, that's a serious Urethra Boner.
by Thugisaurus October 23, 2019
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A curse upon mankind. Only known victim of this curse so far is Hank Hill.
Hank's narrow urethra made him take a minute longer to take a piss, and his chances of impregnating someone is extremely low.
by Deathgrind > you September 23, 2007
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When a male urinates and the pee stream splits to the left and right, instead of shooting straight. This anomaly generally occurs after the male orgasms.
Girlfriend Susie: "Wow. That sex was great. Why do you look so sad?"

Boyfriend Ricky: "Well, I'm just dreading the Urethra Forklin that comes after."

Girlfriend Susie: "What's a Urethra Forklin?"

Boyfriend Ricky: "You know, I've always thought you were a stupid bitch."
by k795 April 4, 2016
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The act of shoving a barrel of a PKP Pecheneg Light Machine Gun up a mans urethra
"If tim doesn't show up to the party, i will show him Urethra Conquest!"
by Freidrich Friednicht August 6, 2012
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The act of shoving/stuffing an object down a males urethra (the hole at the tip of the penis); normally for sexual pleasure.
Bob: "Have you tried sounding?"

Joe: "Oh yeah I've heard urethra sounding is the new thing to get off."
by mcdaddy420papi June 28, 2018
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