Country Dictionary

To increase power.

Let's souped up our car/bike/washing machine.

The result of turning your bone stock into more of a soup by adding something that makes it better.

That BRZ is souped up alright! Look at all the bolt-ons!

Anything that has been modified or upgraded for performance or looks(especially cars).

That car is souped up like crazy.

A Car that has been modified for racing.

Origin: California 1950's

A Car put together like ingredients in a soup.

was illegal drag racing slang.
now is commonly used buy professional racers.

"I think it's rolling stocks! this needs to be souped up!!".

Illicitly manufactured drugs which have been adulterated.

"I got kids dying on my streets from souped-up X!"

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.

Given power that was not intended for it to have.

Souped-up economy car etc.