Plural of foamer; multiple people who foam at the mouth or (in slang) enthusiastic train or model railroad hobbyists.
From 'foamer' + '-s' (plural suffix), creating a plural form of the agent noun.
Railfan culture has evolved a rich vocabulary that includes 'foamers,' 'Budd-heads' (diesel enthusiasts), and 'gricer' (British railway enthusiast)—proving that passionate communities create language to identify themselves.
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