Definition

A jokingly derogatory reference to the 231 area code in Michigan's Northern Lower Peninsula, implying residents have a peculiar difficulty ordering numbers sequentially—basically a regional playful insult about cognitive quirks.

Example Usage

Did you hear that guy say '234' instead of '234'? Total 231 move.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=231&defid=5808603)