I haven't run into that combo personally, but I've been hearing about meth heads "building" bikes. I guess when people start using better locks and you can only get away with a derailleur and a brake you work with what you've got. I've also heard that in the midwest they've been scavenging for arrowheads in fields. (although that probably happened once and the journalist turned it into an arrow-head pandemic)

In reply to the OP, I originally heard the term used to refer to meth addicts and then more broadly to refer to someone who just acted like that. Kind of like people used to call someone a "****z". Oh, and doesn't South Park have a character called tweak?