When you insert your closed fingers in a cone shape into the rectum then spread your fingers open you get the "blooming onion"
"Ohh baby just like that! I love it when you give me the blooming onion!"
by Chateau64 June 19, 2018
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The process of taking a shit in which multiple pieces of shit are produced and land in the form of a blooming onion.
I just took a blooming onion shit! It really looks like a blooming onion!
by XCaliburger June 5, 2017
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When you put an unopened umbrella in a man's urethra and, once it is firmly in place, you open up the umbrella.
Guy 1: Bro, my dick hurts so bad.

Guy 2: Why, what happened last night?

Guy 1: Sarah gave me a Mary Poppins' Blooming Onion and now my dick looks like the Sarlacc Pit.
by djmagicb2002 January 29, 2020
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A very full ashtray
Your ashtray is so full it’s starting to look like a blooming onion
by CarlTensine June 6, 2021
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