oh boy 意思是“天哪”，表示惊讶、高兴或者痛苦的情绪。

【例句】
Oh, boy! Look at his face.
天哪！看他的脸。

"Oh, boy!" moaned Carol, as his old car stalled out, "We got a flat tire."
Carol的车抛锚了，她抱怨道：“天哪，我们的车爆胎了”。