1. Appearing soft. Refusing to go hard. No Bosh
2. A male that displays feminine qualities.
This usage was coined by K-E-V a rapper from Knoxville TN after noticing how NBA player Chris Bosh always just comes across as soft and weak when compared to his competition.
We knew we could win the game but Chris wouldn't put his part of the money up to lock in the bet. Chris is always Boshin when its time to man up.