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1.
to BE ABOUT to split up or break up with one's boy/gilrfriend
to get divorced from one's husband/wife SOON

The expression is used in a rather funny, joking or kidding context, referring to the unfortunate and rather dramatic fact of an imminent break-up/split-up/divorce.
An old man's parents head for Splitsville and he is scared.
by Skinswatcher February 19, 2010