shitbag noun3 •(vulgar) A colostomy bag. •(vulgar, offensive) A worthless or despicable person.I told him what type of shit bag he was and that if I had not taken a strong liking to him I'd kill him. But he had undone my feelings and I was glad we had never got it on. — 1986 •(vulgar) The stomach. formsshitbags