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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 kids' stuff. Now that she's 13, she has no interest in kids' stuff like cartoons or make-believe.
2. By extension, something that is very easy to understand, achieve, or use, especially when encountered by one on a more advanced level. The highly anticipated match turned out to be kids' stuff for the returning champions. Do you have anything more difficult? This book is kids' stuff.
3. slang Marijuana (due to it being seen as a "soft" drug). If he's just getting high on kids' stuff, I wouldn't be too worried. At least it's not hard drugs!
a very easy task. Climbing that hill is kid's stuff. Driving an automatic car is kid's stuff.
kids' stuffsomething that is childishly simple or naive. informal
1982 Vivien Alcock The Sylvia Game He had grown out of the game; it was kid's stuff. Besides it always landed him in trouble.