A baton, often used by Police, that extends out when flicked.

Under pressure
Under the cosh

If someone is under pressure because they have a deadline for a piece of coursework, or your team is under pressure to hold on to a one nil lead, this is known to be 'under the cosh' hence you are under pressure

n. lump of wood, used to hit people. v. to hit with a lump of wood. Standard European Romany word 'kaasht' meaning a piece of wood.

To hit someone over the head.

of the mathematical property of awesomeness

Guitar orientated indie-rock band from the south west of England.

(north london slang)
If you are a cosh, you are basically extremely annoying and should be beaten up