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flap jackin' 

A term for a lesbian sex act similar to scissor sex where the action moves from side to side rather than back and forth. the term derives from the stacking of labia which resembles a stack of pancakes.
This scissor sex isn't hitting it, it's time for some flap jackin'.
flap jackin' by Gigantic Twerp August 14, 2014

Flap jacking 

What is it called when a girl tea bags someone? It's called flap jacking!
Flap jacking by Chucksama November 14, 2013

Flap-jacking

Flatulence while sitting on the floor of a shower.
After a combination of Indian food and a long night, Susan often finds herself the next dat flap-jacking during her morning shower.

flap jacking 

when lying naked on ones bed and jumping on to your stomach then to your back resembling flipping a flapjack
I was flap jacking so hard my bed broke!
flap jacking by MC triple T January 3, 2011

Flap Jacking 

"What did you have for breakfast, Jimmy?"

"I did a little flap jacking"

"deeeeeelicious"
Flap Jacking by Dirty dirty girl January 3, 2007

Flap Jacking 

A tandem masturbatory technique in which the participants lock arms at the elbows whilst gripping the shaft of their penises. They then flap elbows like a bird in synchronization to most efficiently share the work of jacking.
I jerked off with my friend, but it wasn't gay because we were flap jacking.
Flap Jacking by Kingsbury Brothers February 6, 2010