Class needs college female(s) who know this

I run a private martial arts class. I got the word out for it after getting back from overseas, by word of mouth. Many of the students are guys in the age range of 15-22. A few weeks ago, I was approached by a few who'd gotten slapped by college girls and we're humiliated. Apparently a move was used on on them that college girls are experts at. They push out their hip, plant 1 hand on their hip and look directly at him with a cute but mad face, then the other hand slaps them easily. I was asked how to block that move or catch the hand. I'd never heard of it. I thought about it overnight, and the only thing I could come up with that I told them is...I guess keep your eyes locked on her hip pushed out and hand on her hip spot, then look up into her face. Those 2 spots. I really don't know. A few days ago, 2 of them had apparently tried that, and got slapped again easily. I'm guessing these guys are player types, but I don't know for sure. I can't really afford to have several dropping out, that's bad for business. So if you're a college girl who's experienced at using this move on guys, especially players...if you and other girls you know who are experts at this move could come by for an hour and help, I'm willing to pay whatever is necessary. If you know how it can be blocked, caught, etc....please show them. However, if it can't, be honest and tell them that, because I can't figure that move out and Ive tried. Then explain to them reasons you have to use it and ways to prevent it from being used on them. Classes are Wednesday and Sunday, 4-6 and we meet in a public location.