No, I don't think it is a need for a restroom. Most male cyclists are comfortable about announcing this need. And it didn't have anything to do with a cramp because the head was swiveling and the torso was twitching too, all while facing me and talking to me.

I always have good body language, comfortable and relaxed. I don't understand why two different single males of the same age exhibited nervous behavior while talking to me. It just doesn't make any sense. The first time I dismissed it as odd. But when I got the exact same behavior from a second male, I started to think about it and realized I have no idea what it means. In all of my years of cycling, I've never had a male swing their right leg over the frame of their bike while talking to me. Then with the rapid movement of the right leg, the neck swiveling and the torso twitching, it was a lot to take in while facing someone and engaging in conversation.

Maybe it is creepy. I don't know.