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An acronym for "Ugly Slut Weekend". Traditionally celebrated yearly on the first weekend of December, but it's popularity has lead to the expansion of the holiday to multiple times per year. Average to good looking males who participate in Ugly Slut Weekend actively seek out below average to ugly girls for sexual activities.

Alcohol is not required but heavily recommended for the males to further decrease the already small chance of actually skeeting inside the ugly slut and risking a baby mama relationship in future

"No Slut Left Behind" is a the trademark slogan of USW. As an excerpt from it's mission statement reads: "to bring weiner to every slut in the world, no matter her physical appearance"
I heard USW started at SJU, which would make sense considering the amount of ugly Jersey girls that go there
by papa moyer May 14, 2010
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A USW is an Unplanned Shit in the Woods. This is when runners are out for a run and realize that there is no way to make it home or to an available bathroom before needing to have a bowel movement. As a result, you need to find a place in the woods (or the neighbors shrubs) to relieve yourself, preferably someplace with available leaves to wipe with.
I was about 5 miles from home and had to take a crap. I had to take a USW in the bushes down by the lake.
by Runner48168 June 20, 2018
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German abbreviation for "und so weiter", meaning et cetera. Used when you want to put a lot of geeky acronym disclaimers at the end of your mail/message.
You could use the thingamajig with the whatchacallit and it should work fine. Never tried it myself though. IMHO, YMMV, USW.
by krist0ph3r October 21, 2009
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