To fuck someone with great vigour. The dictionary meaning of 'to thrash or beat vigorously' used in a sexual context.
Me: wow she's fit!
You: yeah I'd flail her
by BIg Dogs Cock August 27, 2012
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Slang for getting really high on crystal meth

to do meth, the act of doing meth
hey were are flailing tonight, lets get flailed!
by +j-phizzle+ May 12, 2007
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Another word for 'fail'
He just fell over, flail.
by lolfez November 18, 2010
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To wave ones arms in the air in a spastic, awkward manor. Most commonly performed by gays.
The closet homosexual was flailing his arms in the air when he heard about the I Love Lucy marathon.
by Heidi Montag July 11, 2008
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the act of or being high on crack..also sometimes coke
i didnt go to sleep.we were flailing all lastnite
by cocainebeautifuLL September 21, 2007
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an uncontrolled movement, spastic in nature. An unsuccessful courting ritual during the act of a white "man-child" dancing.
Flail...eg a fish out of water. Also ref: Gumby.
by Empedocles July 19, 2009
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Dude, I flailed so bad with her bra that I never even got to see her tits.
by Jaggo March 21, 2004
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