jill off in English dictionary jill off Meanings and definitions of "jill off" (vulgar, slang, of a female) To masturbate. verb (vulgar, slang, of a female) To masturbate. more Grammar and declension of jill off jill off ( third-person singular simple present jills off, present participle jilling off, simple past and past participle jilled off) jill off (third-person singular simple present jills off, present participle jilling off, simple past and past participle jilled off) more Sample sentences with "jill off" Declension Stem Match words all exact any Try again Authors