This is Anou's reaction to the Stardom president booking her in a tag match against Iwata with Poi as her partner. And this is Poi's reaction to that reaction: a slap on the back which seems to get harder and harder every time. It was Anou who started it. Those slaps were supposed to be a reminder of their promise to fight for the white belt together.
Here's their tweets about it when it was Natsupoi who needed confidence.
I love Tam just watching them from the back