I miss that show...STAR TRUCK!
Lots of 90s shows slipped in adult jokes. Rocko's Modern Life was also full of them. The kids would find the cartoons funny for their outer appearance, and older viewers would get chuckles out of the little innuendos pertaining to society as a whole and more adult topics.
I'm not saying shows have stopped doing that, but many newer ones are much less likely to do so. The reason The Fairly Oddparents does it is because it's been around since 2001 or so (1999 if you want to talk about the original
Oh Yeah! Cartoons! shorts). It is probably one of the only Nick shows I still watch, and its forthcoming cancellation will just leave me less reason to watch TV.
Kyuu - Everything EXCEPT Adult Swim.