jack sock 

A sock used for the purposes of masturbation, often found hardened and flaking, stuffed down the side of the bed in a teenage boy's room. Also the unfortunate name of a US professional tennis player.

Not to be confused with jock sack, a Scotsman's ball bag.

"That guy's name is Jack Sock??!!"

jack sock by Jon Salat November 15, 2017

jack-off sock

a female member of a group of friends who is often used buy the male members as a way of releasing sexual frustrations and frequently tossed aside after like a sock after a load has been shot into it

dave: dude, i just saw you grab karen's ass. do you guys have a thing?
greg: naw, we haven't even done anything. she's just the designated jack-off sock.

jack-off sock by NotASock March 26, 2010

Sock Jack

When a lonely man masturbates ( to the point of orgasm ) into a sock

Dude , I've gone through 4 pairs of socks , just by sock jacking

Sock Jack by MeowChammerpants October 26, 2013

jack-in-the-socks 

v: The art of jacking off into a used sweat sock; usually used by dorm guys, teenage males, single guys and husbands - so, pretty much 'every' guy.

Cleanups are a breeze when you use jack-in-the-socks!

jack-in-the-socks by warmbrother May 25, 2015