A characteristic of a person: Someone who is likely to change their mind about having sex often, and sometimes without warning. This is a sub-category of the word 'fickle', meaning to change one's mind frequently.
Guy: "Fancy a fuck?"
Girl: "Sure!"
Guy grabs her tit
Girl kicks him off: "I don't want to have sex!"
Guy: "You just said you wanted to!"
Girl: "I do!"
Guy: "You're so fuckle!"
Girl: "Sure!"
Guy grabs her tit
Girl kicks him off: "I don't want to have sex!"
Guy: "You just said you wanted to!"
Girl: "I do!"
Guy: "You're so fuckle!"
by Hennerz Notts September 7, 2011
Get the Fucklemug. 
The mode of action the Brain Fuckler uses to cause befuddlement in the minds of its unwilling victims.
Sometimes, if I'm fast enough, I catch a glimpse of the Brain Fuckler, just fuckling the shit out of everyone... and we don't even know it.
by V+D November 9, 2009
Get the fucklingmug. by wytsh June 26, 2006
Get the fucklemug. by J NIZZLE GO HARD May 17, 2007
Get the fucklemug. 