BL Nums is a shortened version of the drink, Bud Light Platinums. Currently Karl's drink of choice, the BL Nums go down "so smooth, you guys" and have led to many of Karl's drunken mishaps. During Cinco de Mayo 2012, Karl went on a chase for a new drink, BL Margs (Bud Light Margaritas). After being rejected for info by Tito at Subway, Karl finally got some after a through the john door heart to heart with Dave.
BL Nums are 6% alcohol, almost 2% higher than their Bud Light cousin. The perfect beer for gettin' conversational, you guys.