4 letter words

Leroy was telling his friend Bubba about the date he had the night
before:  "It was a bummer.  She used four-letter words all evening."

Bubba exclaimed, "Really?  I can't believe you didn't enjoy that."

"Guess again," said Leroy.  "All night she kept saying 'Quit', 'Stop'
and 'Don't' !"