Slang term for someone with learning difficulties or a mental disability. Alternatively, someone who is acting like a moron. Origin stems from random, sporadic open-mouthed head movements typical of sufferers where they appear to be trying to bite their own shoulder.
What do you know, you fucking shoulder-biter?
by Trojan Horse October 22, 2006
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'Shoulder Biter' (Shoulder biting)
An action usually undertaken by a wheelchair bound retard. Because they cant keep their necks straight or mouths closed, they usually wheel about literally biting their own shoulder(s) ..
Heather: 'Jesus Steve, that freak in the chair over there really is a shoulder biter

Steve: 'I know, reminds me of that freak at work, Janet'
by Steve Longhair December 6, 2007
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