Top Definition
Similar to Godwin's Law, Germain's Law states that, in an argument/debate/slanging match, the first person to reference the other person's mother automatically loses.

Guy 1: You totally stole that from a bumper sticker.

Guy 2: It wasn't from a bumper sticker, it was your mum's ass tattoo.

Guy 1: Germain's Law!

by WordsmithNinja March 23, 2009

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