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1.
A Spanglish slang term used to describe a face that has been shaved clean which for a long time (usually years) previous had worn facial hair, such as a mustache or goatee. The naked, newly shaved face gives the appearance of a bare ass cheek.

Nalga is Spanish for ass cheek.
Daughter: What possessed dad to shave his 'stache after 35 years?
Mother: He wanted to try something different, you don't like it?
Daughter: No!! He has a nalga face, he needs to grow it back!
by punxsutawneyrob September 21, 2010