Crystal Methin' = a word commonly used by chavs to describe something as good. Used by MC Devvo. Refers to methamphetamine, a highly potent illegal drug.
Woah, dik'ed that was fuckin crystal methin'!
by Matt Scheepers August 23, 2007
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a common response from a tweeker or meth head, when asked what they are doing.
person makes a call. He says " what are you doing?"

The meth head replies " ah, just methin' around".
by pseudofran August 20, 2011
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