godan verb (-ru)
act like a big-shot; throw one's weight around
Slang verb derived from the name of baseball player 江川卓 (Egawa Suguru), known for his confident and sometimes arrogant demeanor. Used when someone behaves in a self-important or overbearing manner.
彼は最近ちょっと江川ってるよね。
He's been acting like a big-shot lately, hasn't he?
そんなに江川らなくてもいい
You don't have to throw your weight around like that.