Definition
This idiom describes doing something without a specific purpose or intention, typically for enjoyment or on a whim.
就是喜欢、就是闹心、就是闹狂
He decided to sign up for the marathon, just for the hell of it.
他决定报名参加马拉松，只是为了好玩。
We drove to the beach without any plan, just for the hell of it.
我们毫无计划地开车去了海滩，只是因为一时兴起。
She dyed her hair on a whim, just for the hell of it.
她一时兴起染了头发，只是为了好玩。