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1. it wasnt a beanie
2. it was from a very popular indie film

Way too many people at my school use it as a primary method of communication.

Example:
1-D00d whats up n00b.
2-OMFG u are such a fagx0r.
1-Double you tee eff?
2-U f00b, I pwn j00!
1-Don't...

I've heard(and seen) things like that, but I certainly wouldn't call it a dialect. If so, then 1337 is also a dialect and the Summer Language Institute should be scrambling to CounterStrike...