Yang: Oh guy, there is no free lunch.

哦，伙计，世上没有免费的午餐。

youdao

"I almost lost my job today."—"What happened?"—"Oh, I punched out this guy."

“我今天差点丢了工作。”—“怎么回事？” —“噢，我把那个家伙狠揍了一顿。”

《柯林斯英汉双解大词典》

George: "Oh, That's from the guy who shit in my pants."

乔治说：“哦，从那个在我裤子里拉屎的家伙那儿。”

youdao

"For every opinion there is a counter-opinion. Someone says 'oh,he was a blowhard;' someone else says 'he was a charming,sweet guy.' I think the truth is in between;

VOA: standard.2009.12.17

You can do other things too, and I know I'm flying through these oh, actually, this guy is kinda funny. Let's play this.

你也可以做其他的事情，我想我讲得很快,实际上，这个也很好玩儿，让我们试试。

哈佛公开课 - 计算机科学课程节选

Oh, this guy is in it for the love of the character more than anything else.

哦，这个人是因为喜欢这角色超过一切才干的。

我就是超人 - SpeakingMax英语口语达人

"Oh, the guy gets the girl, they fall in love, happily ever after, babies come, I thought that was one way of being loved, " said Monroe, now 26.

CNN: Study links sexual content on TV to teen pregnancy

Oh, and the sandwich board guy got hired, as symbolic as anything I can think of, though obviously not very empirical.

FORBES: The Speculator's Arithmetic

Oh and by the way, the guy on Fox News who says he speaks for the Tea Party is likely the guy in Washington who is hanging close by the studio.

FORBES: Once Effective, The Tea Party Has Become Toxic