Top Definition
When a single mother begins to dwell on being alone for the rest of their life and starts paying more attention to men than their children.
Child: Ugh! Mom is so obsessed with her new boyfriend it's like I don't even exist anymore, and when I do, everything is still about him! It's driving me crazy!

Dad: -sigh- She's just dealing with Single Mom Syndrome (SMS) right now. She'll get over it soon.
by YoMommasSoStupid May 11, 2012

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