cook up

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cook up (third-person singular simple present cooks up, present participle cooking up, simple past and past participle cooked up)

1. (informal) To prepare a meal.

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

2. (idiomatic, figuratively) To manufacture; to fabricate; to falsify; to devise an elaborate lie.

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

   • 2017 January 14, “Thailand's new king rejects the army's proposed constitution”, in The Economist‎:

     For more than two years Thailand's ruling junta, which seized power in a coup in 2014, has been cooking up a constitution which it hopes will keep military men in control even after elections take place.

3. (slang) To prepare a heroin dose by heating.
4. (slang) To manufacture a significant amount of illegal drugs (LSD, meth, etc.)