Since my Latgalian is tragically rusty, I can’t say for sure that the title of this post is, in fact, a vulgur term for anus. But according to the good folks over at YouSwear.com, u’kstapuc’e is precisely the word you should invoke upon being cut off by an aggressive driver in Daugavpils.
More Latgalian curses here. Eastern Latvia not in your travel plans? Prep for Mauritania here, or the Faroe Islands here. And might there be any Telugu speakers in the audience who can verify that lanja-kodka really means “son of a prostitute”?