Wiktionary
cook up
vb. 1 (context idiomatic figuratively English) To manufacture; to fabricate; to falsify; to devise an elaborate lie. 2 (context slang English) To prepare a heroin dose by heating. 3 (context slang English) To prepare a meal. 4 (context slang English) To manufacture a significant amount of illegal drugs (LSD, meth, etc.)
WordNet
cook up
v. prepare or cook by mixing ingredients; "concoct a strange mixture" [syn: concoct]
make up something artificial or untrue [syn: fabricate, manufacture, make up, invent]
Usage examples of "cook up".
I keep a few of the undomesticated variety around in case I want to cook up special dishes for people who don’.