It means to encompas everything. Because we are never satisfied with what we get, so why not throw a kite in there?
This was from Ray Romano's book titled, "Everything and a Kite" (1998). He was describing what one of his twins said when Ray asked him what he wanted for his birthday.
I was going to the store to buy his birthday present, and asked him what he wanted.
He looked up from his cereal and said:
"Everything and a kite." (Romano129)
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