Just because freshly single Nick Cannon spends a night with smoking hot (and freshly single) Amber Rose at an amusement park ... does NOT mean they're banging -- it just looks like it.
But Nick broke it down for us last night on his way out of a sushi joint in the Valley -- explaining why the video TMZ got of Amber and Nick on a roller coaster Friday night ... is proof they're absolutely nothing more than friends.
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