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1.
To increase power.
Let's souped up our car/bike/washing machine.
by Kung-Fu Jesus April 18, 2004
 
2.
to make something stronger, faster, bigger, harder. Most commonly used when creating a player in sports video games.
You need to soup up your player. He is so weak right now.
The gulf of mexico soups up the hurricanes that form there.
by cenibabisPTP March 03, 2010