When one drops a rather colossal and odourous shit. It makes a mushroom shaped splash.
Lewis- "Man I just dumped a human hiroshima in your toilet Jamie!"

Jamie- "You bastard lewis you will kill us all"
by Jimre™ August 8, 2005
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When performing a sexual act involving defecation, said defecator experiences extreme diarrhea resulting in an explosive surprise for the fecal recipient.
Bruce: Hey Lance, wanna try a glass bottom boat?!
Lance: No brah, last time we did that you gave me a Hiroshima surprise...
by ryo101 July 28, 2009
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When you are laying down and have an erection. A large, 400 lb woman walks into the room and jumps on the erection and starts having sex with you.
Guy 1: Dude, Sydney jumped on my erection last night and she weighed like 400 lbs!

Guy 2: That's called a Hiroshima Shockwave!
by FIRESTORM221 April 12, 2011
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Another word for having a Bowel Movement.
Your Ass - Plane
Shit - Nuke
Toilet Water - Hiroshima
Polo: I will reenact the Bombing of Hiroshima.
Marco: What do you mean by that?
Polo: I’m gonna take a big shit.
by TheAngryJanitor May 26, 2019
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1. A marking left along surfaces in Hiroshima of vaporised victims of the atomic bomb dropped in WWII. These were caused by thermonuclear radiation.

2. A derogatory term used to refer to a Japanese or vaguely Asian person. Can be a threat.
1. "The museum has a display showcasing Hiroshima Shadows."

2. "I swear if Long Long fucks up my order at Panda Express again, I'll turn her into a Hiroshima Shadow."
by Stevennapalm January 8, 2017
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The act of having intercourse, pulling out, dipping your phallus into wasabi sauce and re-inserting (similar to Screaming Seagull)
We got Japanese takeout, then afterwards I gave her a Screaming Hiroshima!
by Cheevers30 April 7, 2011
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