To loose your virginity. founded from the graphic novel/anime "Loveless". In which everyone is born with a pair of cat ears and tail. and these represent the person's "innocence". when a person looses their virginity, their ears and tail also disappear.
1:oh my god, eddie's lost his ears!
2: yeah, a noticed him leaving the teacher's office earlier today! that professor's a sicko!
"loose your ears"