4.20

I got it into my head yesterday to look up the origins of the term '4.20'. (If you don't know what it means -- well, what era have you been living in???)
Turns out, it started like all great things. It was code for a bunch of high schoolers to keep their parents and teachers from finding out. They had a lot of different phrases they used, but 4.20 is the one that stuck. They would meet out by the same statue at the same time (4:20). Perfect code.
Nowadays parents know what it means -- kids will have to come up with something else.

My advice? If you have kids, hang out with potheads. Then you'll know the terminology before they do.
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