For Britain, a five pound note, not a ten pound, twenty pound or fifty pound note. GBP currency, alternative to fiver. This word is used for a five pound note because it's the most common type of money in the land of St. George.
Geez 1: Yo man, how much for a zoot of grass?
Geez 2: Your in if you got a queens note...
Geez 1: Safe.