A good boy, in his natural habitat, playing Pokemon and… *grunt* ahhh~ ya know, just relaxin'! pic.twitter.com/Pkv1kohno4
— Little Liam @ CapCon (Soon (TM)) (@LittleLiam117) December 5, 2018
Giggle looks like someone is maybe doing a stinky in his diaper during the playtime? It sure is a little hard to say but i think that is what happening here.