mouth rape verb 2noun 1forms 3 verb2 •(informal, vulgar) To force cunnilingus or fellatio on (someone).Doesn't matter, you'd have your lips on it and I'd tell everyone how you tried to mouth rape me. — 2011 •(informal, vulgar) To force (someone) to perform cunnilingus or fellatio.In the weeks that followed, he was ass-raped by Allgood on some nights and mouth-raped on others. — 2016 noun1 •(informal) The forced giving or receiving of cunnilingus or fellatio. formsmouth raped · mouth raping · mouth rapes