Mad Dogging Face, or "MDF," is when a male constantly has a pissed off look or scorn expression on his face.

Male equivalent to the female version of Resting Bitch Face, or "RBF."
"That new dude, Sam, at the gym seems cool, but he has MDF. He needs to smile more to break that Mad Dogging Face."
by BDNKBoards December 15, 2021
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