They can normally be distinguished by their habits of chain smoking, swigging the cheapest cans of beer their local off licence sells and pissing in suburban streets from mid-afternoon onwards. While wearing clothes from the early 90s.
They're especially prominent in the north-east London areas of Tottenham and Walthamstow, from where they clog up the Victoria line trains.
Male specimens tend to facially resemble red potatoes with buzzcuts if it's been sunny recently, while females inevitably have a look of Vladimir Putin about them.
"Shit, it's next to a gang of pissed-up Doleskis. Let's stand up in the next carriage eh, they probably smell of wee."