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To 'do' a 'Millhouse' is an action; similar in execution to that of feltching small rodents - except that this is usually done by someone small, bespeckled and with a fiesty attitude. Beware - someone caught 'doing-a-Millhouse' is likely to become very aggressive when confronted. Best turn a blind eye and walk away slowly - covering and holding firmly one's own crotch area.
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