1. A person of Polish descent, who is unfortunately targeted by ignoramuses and fools as being dumb and stupid. Yeah, and the British/Americans are the ones talking...
2. A term used between Poles (teens) humorously, when talking about the incompetence of a person of their same kin. Usually considered offensive if a non-Pole says it (casually) to a Pole. (like "nigger" among Blacks)
Etymology - "Polack," from the Polish word "Polak," meaning male Pole, "Polka" is a female Pole.
1700's.
A derogatory term for a person of Polish decent. "Polack" is the German spelling that has most widely been adapted by Americans using the slur. Polacks are characterized as dumb and/or dirty. For more information, see the 2010 documentary film, Polack.
Many examples from television and film are shown the in the 2010 documentary film, Polack.