The word philtrum has 2 main meanings:
1: noun. The little groove between the
bottom of your
nose and your top lip. I have no clue what it is there for, but now you know what it is called.
2: verb. The art of performing oral sex while shaving. This originated because some kid at my school with a dirty mind thought it was 'full
trim'. The term has since caught on and is now widely recognised.