tidy boiler
Also abbreviated to the charming 'T.B.', this means a lovely girl. Not really sure how this came about, but it was all the rage in about 1987. Once heard used as a chat-up line: "My mate thinks you're a tidy boiler. Will you go out with him?" Unsuccesful.
written by Ro* A*ey, approved by Log

(etymology thereof): I think this came from the popularity of the second series of Auf Wiedersehen, Pet which aired around 86/87. It was a favourite of Oz when confronted by an attractive example of the fairer sex. It went round my workplace recently when Pet was re-run on UK Gold.
written by An*rew*Osler, approved by Susan