Wc
From Openwaterpedia
noun - WC is an abbreviation for whitecaps or small surface waves that break offshore due to the wind. Whitecaps are a challenge to open water swimmers because they tend to impede forward progress and reduce visibility.
Usage
How was the swim? Lots of wind and wc.
Synonyms
surface chop, chop, small waves, turbulence, rough water, rough water, whitewater