Tricks are for kids

What does this phrase mean? Where did it come from?

Thank you,

--Jamie.

Welcome. :hi:

It's taken from a TV ad about a breakfast cereal, called Trix. Click
here to read more. (Scroll down to the rabbit). The ad goes like this, Trix (a breakfast cereal) is for kids. :-D Trix and tricks are homonyms: they're pronounced the same way, but spelled differently.

Thanks for the information.

--Jamie

You're welcome.