1. noun - A ridiculous, unbelievable loss that you will likely lose sleep over.
2. verb - To let a seemingly inevitable win slip from your grasp, be it long or short term. Best used when done repeatedly.
3. adjective - Ridiculous in nature.
Etymology - New York Metropolitans (Major League Baseball)
1: "Dude! How did we lose that game...?"
"Don't worry about it, it was just a metropolitan."
2: "Did you see the game last night man?"
"Ugh, did they pull a metropolitan on that one, or what??"
3: "You seem off today, what's wrong?"
"Just having a metropolitan day, is all."
(n) The act of vomiting on another person's ass and then proceeding to violate said person anally, essentially stirring the vomit with your penis (a dildo is an acceptable substitute in the case of lesbians).
Andrew gave his fiancé a metropolitan shortly before the wedding was called off.