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
Oh my God, Justin and James both texted me this morning and I randomly saw Michael at Starbucks yesterday. I think I'm having my graveyard week
by pela January 10, 2018
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