That's why I asked you how you mean, how you mean
Thought you knew about the team, (ay)

Meaning

“How you mean” is a term originating in the West Indies, popular in most places with a sizable diaspora ie. Canada, London etc. etc.

It means, “what do you mean”?

Drake got inspiration from UK MC Sneakbo for this line. He even says so at 3:45
http://www.youtube.com/watch?v=twNV2ItVBcY

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