Superior diss to "jack off" stating someone is so much of a jackoff, he/she is not even WORTHY to be a jackoff; hence FAUX JACK, the fake jackoff. Also to be advanced by additional phrases (see examples).
"Front to back faux jack"
"Mack on kojak faux jack"
"That's not even your dad; you're a faux jack"
"Hurt your back, bruising your sac faux jack?"