hard sock Share definition Flag one sock that has so much jizz in it that it has hardend into an uncomftorable sock. fuck me! this sock that i wore turned into a hard sock!Y?Cause i jizz in it sooo much! hard sock by drinkmachine777 June 22, 2009 0 0 Get merch Get the hard sock mug. Buy Now — $32.95 See more merch