脳のう筋きん

noun

muscle-brain; meathead; hot-blooded idiot

Slang for a person who relies on physical strength and acts without thinking; often used humorously or critically among friends or in online communities.

• あいつは脳のう筋きんだから、まず突つっ込こんでから考かんがえるんだよ。

  That guy is a muscle-brain, so he charges in first and thinks later.

• 脳のう筋きんプレイでゲームをクリアするのは難むずかしい。

  It's hard to clear the game with a meathead playstyle.