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Explosive uncontrollable diarrhea that is alleged to leave behind a mushroom cloud hanging over the used toilet.

The term was first made popular in a 1998 interview with Rolling Stone magazine featuring Eastern European vocalist Yobin Matthews from the 90’s all girl band “Eclipse”.

Yobin explained in the interview that she was known for her explosive diarrhea fits that would often occur at the most inopportune times on tour, making it nearly impossible at times to perform.

Tour manager Jasmine Keyevin confirmed such stories in subsequent interviews that followed the Rolling Stone piece.
“Do not go in there right now! It smells like somebody dropped a Y-bomb!”

“Did WWIII just start, or did somebody drop a Y bomb just now?”
Y-Bomb by BigSexyMcCorkle July 7, 2018
Related Words

dirty bomb

While performing anal sex, the act of withdrawing prior to ejaculation and slapping the other on the forhead while cumming with the shit covered penis.
"Dude, I totally dirty bombed that skunt last night."
dirty bomb by super troop October 8, 2009
occurs during sexual intercourse. when the male reaches ejaculation, he pulls out of the vagina and ejaculates into the belly button of the female, causing his sperm to pool. he then smacks the pool of jizz with his penis, causing it to splash onto the torso of the female. (extra points if it reaches the breasts)
dude, i was banging this slut the other night and she totally let me pull the a bomb!
a bomb by applesauce_ap April 13, 2007
BSGF Bomb(BullShitGirlFriend) : the act of saying you have a girlfriend to get someone else to stop calling / instant messaging you
"After being polite to a single serving friend last month, she wouldn't stop calling me so i decided i had to drop a BSGF bomb on her last night."
BSGF Bomb by tommy gee June 26, 2008
A movie produced by Michael Bay that is big on special effects and lacking in substance. More generally, a movie that is visually entertaining but without any theatrical or artistic worth.
Dude, Transformers could have been awesome but instead it was just another bay-bomb.
bay-bomb by T.T.Henry June 30, 2008

easter bomb 

to put m-80s into an egg and hide it so when your kid finds it, the explosion will show why denver is a city and key bank is a bank
i hid an easter bomb and the first one to det it will become burnt and smarter
easter bomb by nicest terrorist December 24, 2008