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1.
Someone who loves looking at statistics and their data, regardless how relevant those statistics and data are. Often associated with sport.
Billy Beane in the early '90s was considered a stat rat amongst his MLB GM peers for his use of SABERmetrics.
by martyB_003 April 17, 2009
 
2.
A resident of Staten Island most commonly seen wearing velour sweatsuits and/or black north face jackets. Commonly seen wandering around the Staten Island Mall. It can be difficult to distinguish one Stat Rat from another, as they all have the same hair cut/style.
Go to the Staten Island Mall. I guarantee that you will see PLENTY of examples.
by meeshkaa May 20, 2004