freak off verb 2freak-off noun 1forms 5 verb2 •(slang) To masturbate or ejaculate; to have wild or unorthodox sex. •(slang) To decorate (something). freak-off noun1 •(slang) A bout of wild or unorthodox sexual activity. formsfreaked off · freaking off · freaks off · freak offs · freak-offs