After investing your time sweet talking and wining and dining a woman. Bitch slap her during Sex and hold on tight (preferably by her hair) whilst she goes mad and tries to throw you off.
The challenge is to stay on board as long as possible and to ideally break her. Compare times with your friends and earn extra credibility for your time on the bitch slap bronco with female weightlifters or bodybuilders who are larger and stronger than you.
Mate, I managed 90 seconds on the bitch slap bronco with a 6 foot tall bulgarian shot-putter last night!!