Also known as 'the Rift Plain' it is the plain of existence between the Material Plain (Life, the universe, everything you feel, see, hear etc.) and the Ethereal Plain (Ghosts, wraiths etc) It is often said that Limbo is where your souls go after death while waiting to be sent to Heaven or Hell. For a soul to pass from Limbo into whichever part of the Ethereal Plain it is headed it must first accept and understand that it has died. Limbo looks exactly the same as the Material Plain, exact copies, changing at the same time in the same way. Souls and ghosts inhabit Limbo and humans and animals inhabit the Material Plain. Although the dimensions are separate they are said to be together as one, the inhabitants of each can not see, hear, feel or interact with each other in any way. Although some people claim to have seen or communicated with ghosts there is no proof supporting it.

somewhere between here and there;
not quite in Heaven but not in Hell either;
Carribean dance where people bend backwards to go under a stick held in the air and set to music

It is a place of shared consciousness by all dreamers or a shared dream state.

In Dante's Inferno, Limbo is the first circle of hell. Limbo is the home of the dead pagans that were around before Jesus Christ and Christianity. The Pagans are kept here, unharmed, where they live for eternity. They are not allowed into heaven because they do not know God's love. Unbabtized and aborted babies are also sent here when they die.

In games, primarily in roleplaying, limbo refers to the state a character is in while awaiting an action of another character.
The first character can not act without knowing the second his action. When the second player is gone for a long time, it forces the first player to wait, leaving his character in "limbo", stuck in a timeless void.

The existential state for undead zombies because some evil motherfucker won't let them rest in peace.

the place where a man goes in the weeks following unprotected sex with a woman to be judged whether or not he's been condemned to a life of parenthood.