An alternative to "jammin'" meaning just chillin or hanging out.

tastes like stale marmite.

Quite simply, the 'anus' or 'butt hole'

a marmite addict is often very territorial over THEIR jar of marmite. Often results in fists being beaten against walls.
Signs of an addict...
1. expresses extreme concern over a missing jar of marmite
2. attacking relatives and housemates over the potential steal of marmite
3. irrational behaviour towards neighbouring objects when marmite fails to appear for a daily fix

A slang term for the anus.

The politically correct way to describe a man that regularly inserts his penis into another man's anus