What is Umatilla?
1.
N. - The bowel movement resulting from desperately refusing to crap for many days while backpacking, being at summer camp, or otherwise lacking access to a reasonable restroom facility.
Arwen cranked out a painful Umatilla after a week, and it was fortunate that she did not need surgery.
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1.
Another form of the common hangover, however this is the state of feeling light headed the day after a long night of drinking Miller Lit..