A dildo attached to a belt. Usually worn tied around the waist. Originally used to penetrate vaginally or anally a woman by another woman or a man. However recently it is mostly used by women to anally fuck a man, to inflict humiliation in the man and empowerment in the woman. A popular practice is a woman fucking a man with a strapon, and then made him suck it, for a typical ass-to-mouth session.
When he saw her fastening her strapon around her waist, he knew she was gonna fuck him real hard tonight!