What is the meaning of Washboarding?

present participle and gerund of washboard

The appearance of ripples or bumps on a dirt or gravel road, caused by wear from traffic, erosion, or poor grading.

A streaky appearance on solid patches of color printed on corrugated materials, resulting from the uneven pressure exerted due to corrugations.

An unexplained behavior in which bees move across the surface of their hive with a rocking motion.

Source: wiktionary.org