Clc stands for cousin loving cousin. An acronym in the same way as mlm (men loving men) and wlw (women loving women) from the LGBT+ community.
Person 1: Did you hear? Paige is dating her cousin!
Person 2: Oh I heard. She's clc apparently.
When someone has a visage that looks like Pallas Athena from Greek mythology in old, traditional Greek art and sculptures.
Karen: What is up with your Mrs. Fenimore's downward nose?
Marco: Oh don't worry. She just has a Athena Complexion :)