What is was spongebob supposed to be for adults?

There is no evidence to suggest that SpongeBob was originally intended for adults. In fact, the show was created by Stephen Hillenburg, a marine biologist and animator, who wanted to create a cartoon that appealed to both children and adults. The show features surreal and absurdist humor with offbeat characters and pop culture references that can be enjoyed by viewers of all ages. While there may be occasional jokes geared towards older audiences, the show's primary audience has always been children.