To masturbate/wank/spanking the monkey.
Started life as as the word "Jaff" but evolved into "Yaff" after some Spanish influence.
(1)
Z: Where have the tissues gone?
J: Melvin took them into his room to yaff.
(2)
Z: What's Melvin doing?
J: He's yaffing.
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Someone who requires only a small amount of alcohol to get drunk, i.e. Two Can Sam.
Dave had a couple of beers and starting puking, what a Toucan Sam.
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