The sound and feeling male genitalia makes when running naked. Can be quite painful depending on how cold it is.
After streaking across the field Joe remarked "Man, I've got some nasty flippety-flop."
"The only downside to streaking is flippety-flop."
"The only downside to streaking is flippety-flop."
by Alexander'd December 28, 2005
by miyukikalma October 12, 2007