0 past simple and past participle of moon
1 to show your naked bottom in public, as a joke or as a protest :
Why should those who are going about their everyday business or watching television in the evening have to deal with such problems, only to be mooned at by young people?
In a notable 1993 incident, when confronted with a disruptive group of students, he mooned them.
He later mooned the audience from the balcony.
A father and son pair ran onto the outfield and mooned the fans in the bleachers one inning later.
At the end of the song the four performers turned around and mooned the audience.
One inning later, a father and son pair ran onto the outfield and mooned the fans in the bleachers.
And the table in front of the stage, they had been playing euchre all night and screaming and yelling, and they all got up in unison and mooned the stage.