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ugly mug 

The face of someone who is not actually ugly at all, but who acts despicably in public.
I was checking up on my boyfriend online and saw his ugly mug looking back at me from his new profile on match.com.
ugly mug by La-La-Land August 31, 2011

ugly mug 

Giving someone a dirty look. Looking at someone like you're mad at them.
I haven't done nothing to you....... why you be ugly muggin' me?

Ugly mug 

Someone who’s really fucking ugly
That guy named Jet is an ugly mug
Ugly mug by jet_vdl June 15, 2022