Steamer

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Old English stēam ‘vapour’, stēman ‘emit a scent, be exhaled’, of Germanic origin; related to Dutch stoom ‘steam’.

wiktionary

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From steam +‎ -er. The steamer duck or steamer (sense 6.2) is apparently named for its resemblance to a paddle steamer when swimming rapidly.

From steam tug, rhyming slang for mug(“a gullible or easily cheated person; a stupid or contemptible person”).

etymonline

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steamer (n.)

1814 in the cookery sense, agent noun from steam (v.). From 1825 as "a vessel propelled by steam," hence steamer trunk (1885), one that carries the essentials for a voyage.