expression, godan verb (-ku)
Colloquial, onomatopoeic expression for vomiting. The mimetic ゲロゲロ evokes the sound or action of throwing up. Used in casual speech.
飲みすぎて、トイレでゲロゲロ吐いちゃった。
I drank too much and ended up throwing up in the toilet.
気持ち悪くて、ゲロゲロ吐
I feel sick; I think I'm gonna puke.