Top Definition
Named after Sinn Féin leader, Gerry Adams. Similar to Goodwin's law, this variation is an Irish version. When a topic is mentioned by an Irish person or on an Irish forum, as the length of the discussion grows, the probability approaches one that

(1) the IRA, Sinn Féin, "the troubles", Northern Ireland or The Irish Civil War will be mentioned.
What the hell, this forum title was about New Zealand planning on changing their flag and a mere 5 posts in, Adam's Law strikes!
by blueswannabe March 12, 2014

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