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.
An acronym for "shrivelled up little old boy," referring to the appearance of a man's reproductive appendage following any kind of attack on his ego or masculinity.
Trevor: And then she told me that her ex used to tame lions whilst riding Harley Davidsons and solving world hunger.
Dave: SULOB?
Trevor: Yep.
A U.S. classification for conventionally powered or gasoline-electric hybrid vehicle designed to produce minimal air pollution at their point of use, typically 90% less than that of an equivalent ordinary full gasoline vehicle.