bmsn stands for big man special needs, so when your fighting some guy that looks disabled but it’s quite hard, u call him a bmsn
by the urban mandem June 03, 2019
A middle school located in Boerne, Texas. It educated kids of the baddie agenda. Specifically the vapers, stoners, and the goody-goodies. One of the math teachers is a stoner.
The parents were reluctant to send their kids to BMSN, as they had heard awful things about the school.
by magicmushroomsuser February 25, 2019