أحسن الله إليكم السلام عليكم ورحمة الله وبركاته Ustadh, are expressions like “oh my God,” “oh my days,” and “what the hell” impermissible to say? Of course, we should try and stay away from them, but is it a sin on us if we say these things? جزاك الله خيرًا وبارك الله فيكم

The reason why you shouldn't say them is are they invocations? What do they mean? The word God isn't from the names of Allah. And the list goes on, therefore we fall into haram and even shirk if we keep using such terminologies, as there might be one that is shirk and we are not aware of the meaning. So, what is important is to stay away from them altogether.