Top Definition
A prase used when an over-weight person is consuming a large ammount of food, because On the moon, we would weigh much less than we do here on earth.
Tommy,a rather over-weight child, is stuffing his face with pie. His Older brother remarks, "Slow down tubby, you're not on the moon yet."
by Maddie McGregor January 20, 2008
7 Words related to slow down tubby, you're not on the moon yet

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