a particularly foul (and foul smelling) brand of homeless redneck hick who has nothing better to do than pick fights in Goodwill Thrift stores, which he inhabits during all their opening hours, 24/7 365. If a methlab attacks you, he can be distracted by filthy broken plastic toys or any merchandise bearing the Confederate Flag logo. Whille not a particularly dangerous creature , unless he's been into some PCP or crack, then approach with EXTREME caution. In most normal circumstances the methlab's fundamental cowardice can be counted upon to end potential conflicts.
"methlab... underneath the trailer... methlab"
(sung to the tune of sealab 2021)
see also 'el oso', 'capn crusty', and 'garbage can man'