pronounced skee-fee. comes from the word skin and the jailhouse sex toy know as a fifi. when a man who used to be fat loses alot weight,he usually has extra skin around the stomach. a skifi is when you use that extra skin to masturbate with.
jimmy: did you hook up with that chick yesterday?
dwayne: nah, that bitch blew me off. i ended up usin my skifi instead.