the.com/cooker

Slang for a troublemaker, lunatic, or appliance you boil rice in, context decides.

means A device that cooks food by applying heat — or, informally, a person acting crazy or stirring up trouble.

from Straightforward agent-noun formation: 'cook' plus the suffix '-er,' meaning 'thing that cooks' (as in rice cooker, slow cooker). The slang sense for a wild or unstable person is more recent and murkier in origin — likely riffing on the idea of something 'heated up' or 'cooking,' i.e., agitated or off-kilter, rather than any documented single source.

origin shift
meth-cooker slang spawned the generic lunatic usage
uk slang
means a wild unpredictable person, especially online
rice cooker
invented in japan, automated a kitchen chore globally
pressure cooker
cuts cooking time by trapping steam, raising pressure
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