Jim: "Hey Bob, you wanna go to the movies?"
Bob: "I can't man. I just ate a fajita burrito with extra steak, no salsa, and now I've got a bad case of the Chipotle cha-chas."
Kitty cha cha's is when you have an erection and you don't want it because of a social reason, perhaps you're at a party or a open house, so you get a nearby cat to scratch it into submission.
"I had to resort to kitty cha cha's at Christmas dinner with my girlfriend's parents because my slacks didn't hide anything."