Butterface

My mom called me and told me about a party she went to with dad and she described one of the D.I.'s (dance instructors) in this manner:

Mom: "Oh Ating, she had such a sexy-sexy body pero ang mukha parang kabayo" (her face looked like a horse).

Me: "Yeah mom, she had a "butterface".

Mom: "Ma-Mike said the same thing, but her face wasn't greasy!"

Me: "Mom! Butterface comes from 'Oh she's got a nice body, but her face is not.' Get it? But her face...? Butterface!"

Mom: "hmm..."

I didn't think she got it so I changed the topic.