Read the dictionary definition of lip. All definitions for this word.
1. either the outer margin or the inner margin of the aperture of a gastropod's shell
2. the top edge of a vessel or other container
3. either of two fleshy folds of tissue that surround the mouth and play a role in speaking
4. an impudent or insolent rejoinder
1. don't give me any of your sass
5. (botany) either of the two parts of a bilabiate corolla or calyx