A separation of the teeth, as often caused by a lack of adult teeth and a constant excess of sperm cells, man-dick, and general ugliness.

A woman who has had multiple abortions is a "walking graveyard."

n. vagina that once had, will be remembered for the rest of your remaining life...due to contracting a venereal disease that will put you in the graveyard.
It is a common feature most likely to be found on crack whores, town bicycles, and most any unclean woman.

A jar in which you keep 1-2 grams of each different bud you buy over an extended period of time

The state of drunkenness achieved by young people on Halloween. Since alcoholic beverages are always abundant on this holiday and most people are either wearing enough clothes to cover their identity or not enough clothes to cover their undergarments, people always seem to get extra hammered.

The phrase plays off the second line of the chorus in the popular Halloween song 'The Monster Mash', "It was a graveyard smash".

A mental disorder commonly found in "graveyarders", symptoms include:
Sitting in the middle or outside of a circle of people
Talking over someone and cutting them out mid sentence, just to talk about something pointless
Cheating on you Girlfriend/Boyfriend with their best friend
etc

A week when all of your exes or old hook ups reappear in your life within one week. Usually happens a couple times a year, and can be in person, or by phone / social media.

I.e. when all your ghosts come back to haunt you