If it exists or can be imagined, there's a porn of it.
guy1: Have you seen that tentacle porn with Dora the Explorer!
guy2: Yep, still not as bad as Gwen Tennyson blowing an alien while getting fucked by her cousin, mother, and grandpa at the same time!
guy1: Daaaaaammm! rule 34 strikes again!
guy2: Thank god there's no "Chuck Norris fucking Optimus Prime" shit out there.
guy1: You just imagined it, now there is.
guy2: Damn you rule34, damn you!
Hot cartoon women(or girls). The word Toontang generally applies to any animated female that you would love to bang all day, every day.
The most classic example of Toontang is easily Jessica Rabbit, the stuff that wet dreams are made of. Other "celebs" include Marge Simpson, Lois Griffin, Kim Possible, Shego, Mrs. Long, Drew Saturday, and Gwen Tennyson.