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
1 more definition
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