The act created by breasts slapping together resulting from not wearing a bra.
Damn girl, you're flapjacking again.
by AlexaaMmeghan May 18, 2011

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Top Definition
A male with an erection, lies on his back while a second erect male inserts the penis of the first into his anus then lies back. A third male inserts the penis of the second into his anus and lies back forming a stack. A three man stack is known as a short stack, A stack of four or more is known as a full stack. Full stacking has the added benefit of asphyxiating the bottom participants. The flapjacking experience can be enhanced by using maple syrup as lube and having each participant massage the balls of the person above.
Mark, Mike, Jason and Joel were planning a full stack flapjacking session last night but Joel didn't show, so the three had to make do with a short stack.
by crankbait July 27, 2012

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"flapjacking!" (v.) - to engage in sexual interaction with another. (2) Usually follows cupcaking and/or cheesecaking.
I was flapjacking all night long with this FINE ass girl named mahlet!
by Mahlet, Sable December 06, 2006

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Motorboating a girls ass.
That girls ass was so round and fat that I was flapjacking that shit all night long!!
by jjstl April 27, 2010

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to roll down the windows of your car and let your boobs hang out and flap in the wind.
emma was flapjacking last night.
by ashannah March 03, 2010

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The female version of tea bagging.
What is it called when a girl tea bags someone? It's called flap jacking!
by Chucksama November 14, 2013

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Bobbing your legs back and forrth causinfg the excess fat of your thighs to smack together in the hopes of achieving "discreet," public masturbation
Dude I was totally flapjacking in that business meeting today
by levaus January 03, 2014

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To repeatedly flap from your belly to your back, while being naked in bed.
Jones: Do you know what Flapjacking is, in your bed?
Diesel: I don't wanna know.
by flyinghorses January 03, 2011

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