Jerkagility 

The ability of ones arm to effectively jerk off

I have no jerkagility with my left hand, so I must jerk off with my right.

Jerkagility by Carniekman November 1, 2011

jerkability 

a rating of how sexy (or appealing to masturbate to) is,
ratings go from 1 to 10,
1 being E.T. wearing nothing but a sombrero and a strap-on,
10 being Angelina Jolie 20 years ago

Adam: Dude, did you see the Grammy awards last night?

Josh: Heck yes! Megan Fox was so hot!!

Adam: Dude...you're stupid, she's only like a 6 on the jerkability scale.

Josh:wut?

Adam: Her thumbs look like big toes...

jerkability by Beat Off Ben, AKA Ben K. May 6, 2011