Green’s Dictionary of Slang

2000s+ drugs Mephedrone.

2009		Urban Dict. 2 Nov. 🌐 Her: What the hell have you been taking, you look awful! Him: I've been on "meow" tonight .
2013		Esquire 1 Sept. 🌐 Shortly going to [...] hit AB1 for the boozual. Usually teaming with office clout. £50 and line of Meow on the table for the first one with smelly fingers.
2015		http://www.talktofrank.com 🌐 Mephedrone (sometimes called ‘meow meow’) is a powerful stimulant and is part of a group of drugs that are closely related to the amphetamines.