cocksack noun3 •(slang, vulgar) The scrotum.KURT LODER? HE CAN EAT A FUCKIN' FAT COCKSACK. MY BAD, HE ALREADY DOES. — 1999 •(vulgar, offensive) A term of abuse.Stop posting binaries here, you bloated cocksack! — 1999 •(slang, vulgar) Clothing that covers the scrotum in a manner similar to a codpiece.> He merely re-introduced the codpiece, then, didn't he? No. The codpiece was an enhancement device. The cocksack wasn't anything more than an inside-out pocket in the wrong place. — 2000 formscocksacks