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Cause he's a purple dinosaur and Dinosaurs needed to eat meat depending if they we're a carnivore (meat eater) or herbivore (plant eater). And Selena Gomez is an example of a piece of meat.So Barney needed to bite and take nibbles of Selena Gomez.

Or he bit her cause I mean who wouldn't bite Selena Gomez if given a chance :)

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11y ago

What else can I help you with?