1. An adjective to describe a person with mug-like features, or who has just done something which is clearly stupid.
"Oi, you, stop impersonating an ambulance. This is a Church. You Mugface."
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Comically ugly, Unfortunate in appearance, One which should generally be avoided.
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An adjective to describe a person who has done something really stupid.
Can't believe you spilled the wines, Ray. You Mugface!