The Brief Return of Dr. Slump - Vol. 1 Ch. 3 - Arale, the Strongest Hero

[MangaDex]

 

[ch0si]

My sides hurt when she fill the blank in demon lord's name

 

[Jigodain]

I'm glad the joke landed, at least! I loved the original Japanese version of that line but there were a few issues with bringing it into English so I ended up having to tweak it to make it work.