The rule that 60% of definitions on Urban Dictionary are made up by the person making the entry.
The infamous "Slovakian Traffic Cone" Urban Dictionary entry is an example of The Slovakian Traffic Cone Law. As in, it was likely made up by the guy who posted it. There was no such thing as the Slovakian Traffic Cone before that entry was made. I hope.
When you are enjoying a meal with your friends and you prematurely get up and leave them, after telling them a random excuse such as "i need to study", just so you can go and playNCAA.
We all realised we had been stonakered by Liam when we returned to our room to find him playing NCAA and not studying, after he abruptly left the meal we were all enjoying at Bates.