I'm familiar with the phrase from a US advertising campaign some years ago. It was used to promote consumption of "cow juice" when it was getting a bad press because of its fat content. Later the phrase was adapted in "gotta have park, " a campaign to get local support of a particular park in NYC. I'd like to know the derivation of the phrase, assuming it predates the milk campaign.
closed as too localized by tenfour, FumbleFingers, kiamlaluno, Mahnax, tchrist Sep 9 '12 at 23:07
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People were putting these words together in normal sentences as part of everyday communication long before the ad campaigns. The creators of these campaigns simply wanted something short and catchy and came up with the phrases.
Edit: It appears that the "Gotta Have Park" theme is based on a Broadway show tune:
Once again, it's just something people say in everyday speech.