Green’s Dictionary of Slang

1. (UK black) marijuana; thus as adj. strong.

2015		www.reddit.com/r/hiphopheads Grime Terminology Guide 🌐 Piff - Weed.
2017		hubpages.com ‘Roadman Slang 4 Jun. 🌐 Piff - this word comes straight from Jamaican patois, and describes potent, strong-smelling weed.
2019		Jme ‘You Know’ 🎵 Man sells tops, man sells hats / Yeah, instead of selling that piff.
2020		G. Krauze What They Was 65: Fuckinell that smells piff.
2022		Digga D. ‘Stuck in the Mud’ 🎵 Yardman, I'ma use the scissors just to crash the piff (Bill it).

2. (UK black) anything of which one approves, e.g. an attractive female.

2015		www.reddit.com/r/hiphopheads Grime Terminology Guide 🌐 Piff - [...] to describe good looking girls and generally to describe something as good.
2017		hubpages.com ‘Roadman Slang 4 Jun. 🌐 Piff [...] isn't a casual complimentary word, but instead a statement, and is more suited to flattering a girl's appearance or clothes. e.g. Lucy you're looking absolutely piff.