The same thing as shampee and shampiddle; that is, a bottle of shampoo that's been wrecked because some dillhole uranated into it.
John Grass uranated into bottles of shampoo at the Juneau Receiving Home in the very early-1980s, thus converting them into shampotty and subsequently earning the nickname "The Shampoo Killer".
A vacation from a friend, activity, or location (e.g. bar, restaurant) due to committing a shame-inducing transgression (e.g. 86'd from a bar, making out with a friend's spouse). Typically lasts until one apologizes/settles the lawsuit to/with the aggrieved party.
Stan went on a shamecation from hanging out with Kyle after getting inappropriately drunk at his wife's birthday party and being thrown out of the restaurant for arguing with the Asian manager.
Shameyatta (sham-e-yhat-ah) is a very sweet person. Someone everyone likes to be around. Its very hard to gain her trust, but once you do she will show you all the love and affection you will ever need. She is also very funny and attractive.
The female version of a sham. A girl walking around thinking she's 'the shit'. Generally starts fights with other shamettes by pulling at their hair or (fake) Louis Vuitton bags. It's definitely not a good term.