2. A object that reminds you of a really bad moment (Like MINT credit cards)
Fred: That is such a cabbage.
2. David: That clock! It is so....
David: Yeah! that's the word!
Manic laughter of crowd around boy #1
Boy #2: "Shit on My boots, You guys are a bunch of cabbages! I'm going to make like Morrison and choke on My own vomit(=leave)."
The victim's bag is taken, emptied, turned inside out, refilled and returned to them, without them knowing anything about it.
Shaun: (looks under chair) Oh for God's sake!
A moment of social ineptitude would also qualify for you to call someone a cabbage.
John; Matt, you fucking cabbage!