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?
someone who is being a total ass and doesn't quite know it though it is obvious to everyone else.
1) "Mike, you are such a Jerkanoff! I can't beilive you'd make your girlfriend bring barbecue sauce for you to the fair and you don't even thank her for it!"
2) Telling him that he sucked at his solo was such a jerkanoff thing to do! He doesn't have any confidence in himself anyway!
"Jerk" comes from the phrase "Jerking Off" which also means masturbating "able" means having the ability to do something/opportunity do something
Combine them together and you have "Jerkable"
In simpler words, Jerkable means being able to jerk off to something.
Joon Sung Kim: "Bro I jerked off to Hentai yesterday, that shit was awesome"
Aiden Lee: "Hentai??!! wtf man! that shit is unjerkable, how do you jerk off to animated characters"
OR
Aiden Lee: "bro did u see that Ash Kaashh gawk gawk video?"
Joshua Hwang: "Yeah man, that shit is jerkable as FUCK"