Cow And Chicken: The car is out of gas, Cow beats up 2 beavers, that turn into cans of gasoline, and mom says: "Look dad, Cow has beavergas!"

Dexters Lab: Mom in the produce section holding up 2 melons. Dad says: "Funny how one always looks bigger than the other"

In "Tiny Toons" and "Animaniacs", seemed like almost every joke was a double entendre.

there's also in Dexter's Lab when Dexter was going on a scavenger hunt and the neighbor lady has a massive @$$ labeled "Dad's Trophy"