The definition you're reading right now, yes, this one, has the highest amount of thumbs down on urbandictionary.com. Therefore, it is the lowest rated definition on urban dictionary.
See also: poopies, weenie and picklebutt.
Norman: Wow, look at the amount of thumbs down on that definition! It must be THE LOWEST RATED DEFINITION ON URBAN DICTIONARY.
Christopher: *Gets in Norman's face* I'm going to find out where you live, break into your house while you're sleeping, tie you to your bed, and SLIT your THROAT.
Artisan Definitions are well made, precise to the point, are skillfully demonstrated in sentences, and have multiple useful definitions, even if the word is made-up.