1. Not to be confused with Boss Bitch, Boss Hog and or Boss Ass.
2. Related clearly to the stated action of a Boss.
3. A decision exercised by a Boss, that is gangsta as hell
4. Defining an object with authority when asserted with dominance, etc.:
Susan closed a $10 million deal this morning, Bossish!
You want to be a boss, then get out there and be Bossish, Shut the hell up and close that damn deal.
That TESLA is seriously Bossish.