1 definition by KingRolo
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 Nov 3, 2010 add a video