Sure, there's some suggestive content (Peanut sure is unpredictable...). Sure there's some minor language. Sure there's some drugs and violence. But don't let that fool you. This is a hilarious comedy about a guy named Harvey Birdman who is a lawyer defending classic cartoons. Scooby-Doo and Shaggy being accused for using marijuana? Fred Flinstone being accused for being associated with the Mafia? More crazy cases come up later on. Pretty soon this show's gonna end. Don't let that fool you either. This is an awesome show for 12+.
Some episodes aren't too bad for kids, and are only rated TV-PG; but know your kid on the TV-14 ones. A lot of them have sexual references(which mostly come from Peanut)and some suggestive dialogue; but overall, It's not as bad as some shows you'll see on Adult Swim. I say it's a funny show for 11+.