I don’t know what a pogchamp is, but I wouldn’t mind her calling me one.
A pogchamp comes from the term poggers, which means awesome or terrific. So, when someone calls you a pogchamp, it means that you think they are awesome or amazing.
Basically, you can use poggers and pogchamp interchangeably, like maybe you say “My Tomodachi is my pogchamp. It is totally poggers.”