- (of a whale) to slap the flukes against the surface of the water.
Origin of lobtail
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for lobtailing
They have been reported pitchpoling (spy-hopping), lobtailing, and—rarely—breaching.Whales, Dolphins, and Porpoises of the Western North Atlantic