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Your jerk off sock. That stiff, rigid man mustard crusted sock under the bed you pray your mum doesn’t find.
I’m so upset right now. I cleaned Johnny’s room and found a dozen mustard socks under his bed.

I always jerk with a mustard sock. Much less messy.
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by Tugg N. Harder June 15, 2018
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2
Your jerk off sock. That stiff, rigid man mustard crusted sock under the bed you pray your mum doesn’t find.
I’m so upset right now. I cleaned Johnny’s room and found a dozen mustard socks under his bed.

I always jerk with a mustard sock. Much less messy.
via giphy
by Tugg N. Harder June 15, 2018
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3
A troll who thinks he's actually good at something he's not, most likely a video game, but can refer to anything.
This guy is horrible with Pikachu, he's such a Mustard Sock.

Good thing this Mustard Sock has no idea how to play LeBlanc, that hero is imba.
by KingRolo November 03, 2010
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4
When you shit in your dads mouth and he sneezes on your ass hairs which you cut off and feed to your mom.
I really hope my son gives me a mustard sock tonight!
by Bonerific Juice Omelet June 10, 2018
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