from the wrong side of the tracks

From a part of a town or city that is particularly impoverished (and usually dangerous or undesirable as a result). I was always looked down on as a kid because I was from the wrong side of the tracks. His mother didn't want him dating anyone from the wrong side of the tracks. I don't know why she's even talking to that kid—she's head cheerleader and he's from the wrong side of the tracks.

from the wrong side of the tracks

If someone comes from the wrong side of the tracks, they come from a poor or unfashionable area of town. I know kids back home who come from the wrong side of the tracks. When they go to school, they haven't eaten and their clothes are all torn. Note: Railway tracks sometimes mark boundaries between different parts of a town, for example between richer and poorer areas.

from/on the ˌwrong side of the ˈtracks

(informal) from or living in a poor area or part of town: She married a man from the wrong side of the tracks.