1. Plural of foamer; people or things that foam or produce foam.
Usage: general use
2. Informal: enthusiasts or hobbyists, especially railroad enthusiasts who chase trains.
Usage: informal; chiefly North American

Examples

• The detergent produced thick foamers when mixed with water.
• Several foamers gathered at the station to photograph the vintage locomotive.
• The shampoo is known for its rich foamers that clean gently.
• Local foamers tracked the rare steam engine across three states.
• These cleaning products are excellent foamers for tough stains.