hacer un calvo znamená v Angličtina

moon [mooned, mooning, moons]▼(to display one's buttocks to)
verb
[UK: muːn] [US: ˈmuːn]

mooning▼(Act of showing one's buttocks)
noun
[UK: ˈmuːn.ɪŋ] [US: ˈmuːn.ɪŋ]