A Nacho Face is similar to a butter face, only a more extreme case. A truly shocking case of mismatched hotness betwixt face and body. As in: You look good, but nacho face.

Got the covid-19 vaccine

You meet a lady. Its dark. Perhaps a club, or the street at night time. She has a nice body. You like it. But then the strobe/street lighting sweeps up to her face. She has a bad bad face. You don't like her face. You walk on by. Disappointed. You then find yourself at your parents house. You make small talk with your mother (the relationship is awkward). She says, "met any nice girls, recently?". You reply, "almost, it was in a club/ the street, she had a fine body, damn, but NACHOFACE".