LUKE: OK. We need to get you out of here.
LORELAI: No. That Lothario over there has wormed his way into my daughter’s heart and mouth and for that he must die!
A Lothario is a man who is an unscrupulous seducer of women. It comes from a character of that name in The Impertinent Curious Man, a story-within-a-story in the 1615 novel Don Quixote by Spanish writer Miguel de Cervantes.