mad mugging 

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.

mad mugging by Mad Maxie September 12, 2013

mad muggin' 

An extreme look of disgust and anger; usually followed up by an "aw $h1t," or a "What the fu*#?"

Lebron James has clearly scored a basket, but is called on an offensive foul; his face wrinkles up with a frown and someone in the audience says, "Man, he's "mad muggin'."

mad muggin' by Tony Musso May 23, 2007

mad muggin' 

similiar to ugly muggin' but used when the face they made you was more sarcastic and all in fun. Often used in office settings, when you tease someone you get along with well.

Lisa, I saw you mad muggin' me when I walked by your office!

mad muggin' by Foto October 16, 2007

Madmugging 

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.

Madmugging by Publiusj July 28, 2012