anilingus
/ˌænɪˈlɪŋɡəs/Definitions
1. noun
a form of oral sex in which the mouth and lips are used to stimulate the anus
“The medical textbook included a detailed description of various sexual practices, including anilingus.”
2. noun
a sexual activity involving the stimulation of the anus with the mouth
“The couple’s discussion about anilingus was a sensitive topic.”