My dev friends used to do this as a sort of inside joke around the office. If you were cool and hip, you wrote emails like this as a way to sort of thumb your nose at the establishment.

I did it for a while until I was considered a "senior" dev and one of the VP's pulled me aside and said it reflects poorly on me when I'm not using proper grammar. He said as a senior dev in the org, I should hold myself to a higher standard. At which time, I started using proper grammar.

Always puts a smile on my face when I see this is still a thing in certain circles. Nonconformity isn't quite dead - and that's a good thing.