A term used by NDSU students to describe a day of skipping classes and ignoring homework.
Person 1: Hey bro, how's your week been?

Person 2: Terrible. I'm thinking of taking a Bison day.
by Dr. Bison January 19, 2011
Get the Bison day mug.
A day to skip class, sleep in and get drunk.... really really really drunk.
Bison Day, the REAL reason people go to college.
by CanIGetAHottub February 3, 2011
Get the Bison Day mug.