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Definition of mooner in English:
mooner
noun
1Informal. A person who moons or idles about.
2Slang. A person who exposes his or her buttocks.
Origin
Late 16th century (in an earlier sense). In sense 1 from moon + -er, after post-classical Latin lunarius, itself probably arising from a misreading of limarius. In sense 2 from moon + -er.
