Onomatopoeia

After leaving my makeup brushes all over the living room, C brings me an empty Chapstick container.

C: I used all your chapstick.
Me: You shouldn't have done that. Where is the lid?
C: I don't know. Maybe over there. (Goes to find lid.)
Me: If you can't stay out of my stuff, I can't let you into my room.
C: Pbbbbbbbt!
Me: Go sit on your bed. You don't spit at Mommy.
C (walking to her room): Pbbbbbbbbt! Pbbbbbbbt!
Me: If you spit again, I'll have to spank you.
C: "Spit!" "Spit, spit, spit!"

Sigh.