Inside has developed from being a preposition simply meaning withing a building, to meaning just about anywhere in the world. It is an incredibly unhelpful way to assist anyone who is in genuine need of assistance in locating something. It can also be a reference to someone's testes.

A deranged, poorly-planned attempt to seize power; particularly if an election does not turn out in your favor.

A girls inside of vagina.

In prison.

something you say, after you've joked with your friends in front of a group of other people and they look baffled...
insiderjoke

I did an inside job

To be in something or somewhere.