Abbreviation for bull shitting. Usually the slang term for bull shit is โ€œbsโ€. So bsn is bull shittIN. It makes perfect sense.
Iโ€™m bsn right now, I got mad homework to do.
by Erikboyz December 5, 2020
abbreviaton for business
by 13flol August 25, 2006
Bio-Engineered Supplements & Nutrition

The best shit you can buy on the market!
BSN True-Mass is so delicious bro, I swear it tastes just like cake batter!
by iBJocking January 30, 2012
Bakk Street Niggaz!!
BSN are da Hottest younng Niggaz in town an yall cant Fuk wit dem theyre also known around Texas an very popular but get straightt to da moneyy Kuz dey known to Finesse!!๐Ÿ‘ฟ๐Ÿ‘‘
by BSN da GaNg February 7, 2019
bsn means - โ€œbullshittingโ€ or bsing
That boy is bsn thinking Im about to feed his dog.
by Bigbootyjooty May 24, 2018
Bakk Street Niggaz!!
BSN are da Hottest younng Niggaz onnat shitt an yall cant Fuk wit dem theyre also known around Texas an very popular but get straightt to da moneyy Kuz dey Known to Finesse!!๐Ÿ‘ฟ๐Ÿ‘‘
by BSN da GaNg February 7, 2019