Dependant on tone and context, knobshank can be used as a friendly or unfriendly term to insult someone who may have done something, or simply is, stupid.
Friendly: 'I can't believe how drunk you got, you knobshank.'
Unfriendly: 'That guy is a complete knobshank.'
Unfriendly: 'That guy is a complete knobshank.'
by Bob October 31, 2004
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