1. superlative form of boss; most excellent, impressive, or in charge
Usage: informal; slang; chiefly North American

Examples

• That's the bossest car I've ever seen.
• She's the bossest player on the team.
• He thinks he's the bossest guy in the room.
• That was the bossest move in the game.
• The bossest part of the concert was the finale.