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someone who has indulged in too many drugs causing their jaw to swing side to side, possible grinding involved.
fuck, dangerous dan just did a hollywood line in the bathroom and is jaw-jackin like a motherfucker. i.e. jaw-jacker
by avandalis March 02, 2006
a person that never shuts the fuck up
John is such a jaw-jacker.
by pabs December 21, 2003