1. a person who is enthusiastic about or obsessed with a particular hobby or interest, especially railroads or trains
Usage: informal; often used in railroad enthusiast communities
2. a beverage or drink that produces foam or froth
Usage: informal

Examples

• He's a real foamer when it comes to vintage locomotives.
• The foamers gathered at the train station to photograph the rare steam engine.
• She ordered a foamer at the coffee shop—a cappuccino with extra foam.
• Train foamers spend weekends tracking schedules and collecting memorabilia.
• The beer foamer overflowed when he poured it too quickly.
• Local foamers organized a trip to ride the historic railway line.