cook up

verb

1. To prepare (food or chemical substances) by cooking or heating.

   “Let me cook up some eggs and bacon before you go.”

   “To cook up a batch of biodiesel, scientists stir together methanol and vegetable fat.”

2. To manufacture; to invent (something, often a deceit or falsehood); to counterfeit (something).

   “The financiers cooked up an instrument called a collateralized debt obligation.”

   “He really cooked up a good one this time, something about an airline disaster.”

3. To prepare (heroin, opium, crack, or meth) by heating or otherwise manufacturing.
4. To manufacture a significant amount of illegal drugs (LSD, methamphetamine, etc.).
5. Used other than figuratively or idiomatically: see cook, up.