An as of yet untested sex act in which the perpetrator, whilst being fellated by the victim, screams "BANZAI!!!!!" and rips a deafening (preferably wet) fart directly in the face of said victim. Extra points are awarded if victim is either drunk from excessive saki or is somehow dressed as a geisha.
"I no longer have a girlfriend after our night in Tokyo ended with a Japanese War Tuba at the hotel."
by Gjers July 10, 2006
When you're having sex with a girl in reverse cow girl position and then she gets up and shits on your dick. Then you cum on your own dick and she sucks it all off.
by Mike Cannon May 22, 2004
Close to the Japanese Rain Goggles but your man only has one nut sack that drops. Picture the Monopoly guy or Mr. Peanut.
I was trying to give my girl the Japanese Rain Goggle but it was cold and only was able to give her a Japanese Rain Monocle instead.
by Mr.Ballsack August 30, 2013
When a man has an extremely large boner and the female/male (depending on preferences) grabs the large boner and bends in a very obstructive fashion, which may lead to a crack in the pelvic area.
I was at my friends and he was having a very pleasurable dream and so i decided to give him the japanese whammy bar.
by 69 Baby Jesus 69 July 01, 2009
When you piss on someones face, getting it all through an onion ring, then shitting all over their face.
by AlimonyBob May 28, 2011
When a male is performing anal sex on a female (specifically in the reverse cowgirl, or the missionary position) and the female proceeds to extricate feces in the midst of anal sex onto the males genitalia
Him: Hey babe you want to try the Japanese fire cracker?
Her: yeah sure I haven’t shat in 3 days let’s do this
Her: yeah sure I haven’t shat in 3 days let’s do this
by Wacka flockin November 01, 2017
by Tidymyroom March 14, 2021