ass-out
n.— «Getting the thing down is hard enough normally so when you are lying on your side and the spinnaker is flogging violently it becomes very difficult. We affectionately call the maneuver a “wipe-out’ or (excuse my French) an ass-out and its something that we know will happen probably a handful of times during a leg like this.» —“At Sea. Volvo Ocean Race: A fright for Ericsson, with a broach all standing, then a Chinese gybe” by Steve Hayles BYM News Feb. 27, 2006. (source: Double-Tongued Dictionary)
Further reading
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How and why do words from one language find their way into another? Vietnamese, for instance, includes lots of words borrowed or adapted from French. Such linguistic mixing often happens when languages brush up against each other and speakers reach...