A chumpet is a complete knobwit.
A cross between a trumpet and a chump. He is usually your boss, predominantly named Alex. He gives trumpet to his superiors whilst affecting chump like symptoms to employees.
The female equivalent to a lemon party, this occurs when more than two elderly women get together to butter each other's crumpets. Not to be confused with mah dong night, during which more than two elderly women get together to watch male strippers.
"Hey, hon, where's your mother?"
"Off playing bridge with the gals, I guess."
"Ah, Christ, not another crumpet party!"
Once in a while, for whatever reason, a rectreational drug dealer, even the most reliable and friendly ones, will make the deal fall through on purpose. This is to let the customer know who is the boss, and is usually passive-aggressive. It really can be disappointing and frustrating.
Boy, I really got chumped today by my rock and roll doctor. He said he had some lebanese blond in hand, and he said it fell through after I drove for two hours to get it. Oh well, at least I have this swagg.