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1.
When you have an angry scowl on your face during a dance off. Or, an overly serious expression while preforming some interpretive dance
Molly had a blast mad mugging with her girls to Bel Biv Devoe.
by Mad Maxie September 11, 2013
 
2.
Giving threatening looks to another person meant to evoke fear of an imminent attack
The rival gang member was madmugging his enemy, by glaring at him in a threatening way meant to evoke fear.
by Publiusj March 12, 2012