cook up verb 4cook-up noun 1forms 4 verb4 •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. •(figurative) 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. •(slang) To prepare (heroin, opium, crack, or meth) by heating or otherwise manufacturing. •(slang) To manufacture a significant amount of illegal drugs (LSD, methamphetamine, etc.). cook-up noun1 •A get-together for the purposes of cooking, especially one that produces large quantities of food. formscooked up · cooking up · cooks up · cook-ups