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a nickname for the Union Pacific Railroad company, typically used by Union Pacific employees.
I had to wait at the crossing for uncle pete to pass by.
by gilmore January 07, 2007
A noun which describes the act of taking a dump at someone else's house. There once was actually an Uncle Pete who repeatedly shitted at others' houses, but his exact name and time of existance has been lost over time.
Can you pause the movie for a few minutes? I gotta go take an Uncle Pete.
by Doo Brown March 12, 2007