Bakehead has two distinct meanings: in railway slang, it refers to a fireman — the crew member responsible for maintaining the firebox on a steam locomotive, who was often closest to the intense heat. In drug slang, it refers to a habitual cannabis user, drawing on the idea of someone whose head is perpetually 'baked.' The two senses are entirely separate in origin and context.
The old bakehead kept the boiler at peak pressure through the mountain pass without breaking a sweat.
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Has two unrelated senses: in British slang, a person who uses cannabis regularly; and in railway informal language, a fireman who tends the furnace of a steam locomotive. The cannabis sense uses bake (slang for getting high) plus head (a habitual user). The railway sense uses bake in its literal heat sense. Both are informal; the cannabis sense is more current.
He'd been a bakehead since university but managed to keep it completely separate from his work life.
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(rail transport, informal) A fireman .
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(slang) A person who uses cannabis.
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