Definitions by B. Dub

F.A.C. 

An acronym for Flat-ass calm. Used by sailors, fishermen and people who spend time on the water to describe a sea like glass.

"Going surfing today?"
"Nah man, it's F.A.C."

--or--

"Good day for fishing, it's F.A.C. out."

F.A.C. by B. Dub July 31, 2012