Urban Dictionary: mother-in-sin

1.	mother-in-sin
	term for a live-in lover's mother. My mother-in-sin is much nicer than my ex-mother-in-law. buy mother-in-sin mugs & shirts brother-in-sin sister-in-sin father-in-sin baby daddy drama mother-in-law ex-mother-in-law by Johnny J. Rockability Jan 4, 2011 add a video

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