An in-joke is a joke whose humour is only clear to those people who are "in" a group which has some prior knowledge (not known by the whole population) which makes the joke thus humerous. The group of people could be just a few people who work together, or residents of a particular town, or people who watch a particular television series or whatever.
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... 3,059 people, 1,181 households, and 818 families residing in the town. The population density is 81.3/km² (210.6/mi²). There are 3,008 housing units at an ...