sexo UK /ˈsɛks.əʊ̯/US /ˈsɛks.oʊ̯/ noun2 •(Australia, slang) A sexual offender.‘Maybe it's only me,’ said Prudence. ‘Maybe he's only laying for me. Maybe he's a sex-oh.’ — 1963 •(slang) Synonym of sex (“sexual intercourse”).