Diaperbutt

I pat his butt and say "hey there, silly big diaperbutt. Whatcha doing big padded diaperbutt?" He laughs and turns around and starts to touch my face and we play momma/baby games.

Source: wiktionary

"But better to call him something economic than to take to calling him Booger or Diaperbutt." David chuckled. "I like you, Jane," he said. "You know, I think I like you more now than I ever did."

Source: wiktionary

[…] motioning to the little diaperbutt making her way across the wide lawn. Jess ran over and scooped her up, again, and settled her on her hip.

Source: wiktionary