slang A swimmer, as opposed to a surfer. Hey, watch out for those fanny-dippers when you go back out there with your surfboard.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. a swimmer, as opposed to a surfer. (California.) The fanny-dippers are not supposed to go out that far.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.