When you get done eating your girl out and she came on your face
Chris - What is on your face Paul? It looks like you got clam faced.
Paul - Well I just ate the boss out 5 minutes ago. She was extra horny today so I had to do it early today.
Middle aged female that you can smell during hot yoga, and has noticeably weathered skin due to intense tanning. High likelihood of excessive folds that not even spanx can contain.
person 1 "Great Friday yogasession, but did you notice that clam mom in the front row?"
person 2 "Yeah man, couldn't miss her"