to spend time doing things that are not useful or serious : to waste time 把时间花在无用或不重要的事情上:浪费时间
I spent the entire afternoon messing around on the computer.我整个下午都在摆弄电脑。
mess with
to handle or play with (something) in a careless way 漫不经心地处理或玩弄
Don’t mess with the camera! You’re gonna break it!别乱动照相机!你会把它弄坏的!
mess with sb's mind/head
something that causes you to feel confused (informal) 使你感到困惑的事物
Have you ever seen the movie Memento ? It totally messes with your head.你看过电影《记忆碎片》吗?它完全搞乱了你的大脑。
I'm just messing with you!
I'm just kidding. I'm joking. I'm just pulling your leg. 开玩笑
A: Are you telling me you lost 20K dollars at the blackjack tables last night?你是说你昨晚在21点的赌桌上输了2万美元?B: Nah, I'm just messing with you. I only lost 19K!不,我只是在和你开玩笑。我只输了1万9!