The quality of flexibility and overall athleticism that makes someone good to fuck. Also, fucksible (adj.)
"Now I know why I'm sore after we have sex. That was a tough position to hold."

"Yeah, I was impressed by your athleticism."

"Thanks. Do you mean flexibility or endurance?"

"Both--and did you just say 'fucksibility'?"
by elavid February 19, 2012
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When a person is flexible in bed, literally and figuratively.
Person 1: Hey babe, do you wanna try the Golden Gate Blowjob?

Person 2: Yeah, I'm pretty fucksible.
by bigboibradley September 17, 2019
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