Something that flaffs or flutters; something that waves or moves loosely and rapidly.
From 'flaff' plus the agent suffix '-er'; primarily found in Scottish dialect speech and historical texts from the 16th-19th centuries.
In old Scottish fishing communities, 'flaffer' described the sail fluttering when wind was inconsistent—fishermen developed incredibly precise vocabulary for different types of wind and water movement based on survival.
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