I'd buy anything that was going cheap because it was bumped, but not meat. Packets of bacon are always a favourite for junkies to steal, fuck buying bacon off a jagger in the pub though lol. Bottle of vodka/whisky? Aye, no danger.
The last time a dude tried to sell me a bottle of whisky he'd literally just knocked it out the shop 30 seconds earlier (we were walking past the shop at the time!) & was carrying it wrapped up in his jacket like it was a baby haha. He must have been too used to buying/selling gear because instead of saying "It's a litre bottle of x" he said "It's a 20 bottle, I'll sell you it for a tenner" as though he was saying "It's a 20 bag" lol.
On the way home one night after work a jakey tried to punt me a pair on Timbies! His sales pitch was so odd though, I had no idea he was trying to sell me something. I stopped outside a pub to ask an old boy for a light, then this guy rocks up "Here mate, what size shoe are you?" "Ehm, a 9 bud, why?" "Dae ye like Timberland boots?" Haha, get to the point cunto!