To fuck someone with great vigour. The dictionary meaning of 'to thrash or beat vigorously' used in a sexual context.
by BIg Dogs Cock August 27, 2012
by +j-phizzle+ May 12, 2007
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
i didnt go to sleep.we were flailing all lastnite
by cocainebeautifuLL September 21, 2007
an uncontrolled movement, spastic in nature. An unsuccessful courting ritual during the act of a white "man-child" dancing.
by Empedocles July 19, 2009
v., To fuck oneself six ways from Sunday.
by Jaggo March 21, 2004