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1. That which is only suitable for young children, especially from the perspective of an older child or adolescent. She asked the boy if he wanted to color with crayons, but he said he didn't like that sort of kid stuff. Now that she's 13, she has no interest in kid stuff like cartoons or make-believe.
2. By extension, something that is very easy to understand, achieve, or use, especially when encountered by someone of a more advanced level. I was expecting to be challenged a bit more in the new job, but most of it is proving to be kid stuff to me. Do you have anything more difficult? This book is kid stuff.
3. slang Marijuana (due to it being seen as a "soft" drug). Don't bother offering any blow to Marty. He doesn't want to try anything besides the kid stuff.
Something very easy or uncomplicated, as in That new computer program is kid stuff. This usage alludes to something suitable for young children, or "kids." [c. 1920]
n. marijuana, a drug for beginners. (Drugs.) He’s still using kid stuff.