flexer
nounUK /ˈflɛksə/
US /ˈflɛksər/
A flexer is someone who shows off what they have or what they can do.
He's such a flexer, always posting pictures of his new shoes.
OTHER MEANINGS
2. A person or thing that bends or flexes something, such as a muscle.
The flexer machine at the gym helps you bend your arm.
3. A muscle that bends a part of the body.
Your biceps is a flexer that helps you lift things.
4. Someone who bends rules or changes plans to fit what they want.
The coach was a flexer and moved the game to a later time.