Code for "period" or "period, misery". "Beaver Dam" = "tampon", "Maxi-pad", etc., and "Missouri" is code for "misery".
TOM: "Hey, Eric, how about you and Laurra coming over for dinner tonight?"

ERIC: "No, Laurra's in Beaver Dam, Missouri right now."

TOM: "Oh, okay, I get ya."
by Jack Bozdog September 6, 2006
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