A fork of Rural Dictionary
the curve of the upper lip - where it curves and then there is a slight dip. it is in the shape of a bow, and lips are the 'love'(cupid) of your face. hence the name "cupids bow" some cupids bows dip loads more... and almost go down to the bottom of the top lip (where the lips meet). there are also lips that do not have a cupids bow, so they would just be rounded at the top with no dip so it would be like a mirror image of the bottom lip.
person a: you have really nice lips person b: thanks, yours are nice too person a: well not really, i dont have a cupids bow person b: so...