Anyone know the derivation of 'honk' for throwing up ?

And yes, Rowan - there's always carrots.

Faffing about.

Fiddling and fartarsing about.

For the penurious - tight as a crab's arse (water-tight).

'Crabs' in the context of pubic lice = mechanised dandruff. Also 'Sandy McNabs' in rhyming slang.

For the intellectually challenged : thick as a piss-stone and twice as wet.

(US : for 'piss-stone', read 'urinal').

A large lady might have an arse like a dray-horse.