2. Yeah it can mean $20 worth of something, but we already have the words 'dub' and 'twanky.' Which from the perspective of a twizzle-sketcher, needs to be less masked in cryptic slang due to general lack of money anyhow. Twizzle is also considered to be more feminine than asking for sketch or twack.
2. Fiend:"Hey guy on motorcycle, you know where the twizzle is at?"
Bandido: "F**k off boy"
(Currently used by about 5 people in a boarding school in the North of England)
Care-taker: 'You need to twizzle 'em otherwise they'll become black and stink of old farts.'