It was the best I could think of off the top of my head.

这是我能马上想出的最好办法。

《柯林斯英汉双解大词典》

I can't remember the name off the top of my head, but I can look it up for you.

我一时想不起这个名字，不过我可以给你查一查。

《牛津词典》

—What does the stuff on your T-shirt mean? —It's nothing. Just something off the top of my head.

——你 T 恤上的东西是什么意思？ ——没什么，只是我即兴想到的。

youdao

Alums with Nobel prizes? Oh, I don't... I can't think of any like, off the top of my head.

获得诺贝尔奖的校友吗？这个……我一时还想不出来。

知道约翰·纳什吗？ - SpeakingMax英语口语达人

I guess right now, off the top of my head, I'm really into, I've loved Kanye West forever.

我觉得现在，我脑子里想到的，我真的，喜欢肯耶·韦斯特，永远都喜欢。

只要是音乐就好 - SpeakingMax英语口语达人

It's really hard to think of all stuff off the top of my head.

脑子里一时想到的都说出来还真难呢。

只要是音乐就好 - SpeakingMax英语口语达人

Using my teeth, I would carefully tear off the top of my first dumpling and watch the steam rise.

WSJ: Babushka's Dacha Dumplings

With that much experience under my belt, I might be able to solve your legal problem off the top of my head.

FORBES: Secrets of Super Negotiators - Monetize Everything

Reporters call me directly and I have to answer them off the top of my head.

FORBES: Creating And Conveying Your Media Message -Media Training