There's no such thing as bad hands and good hands, maybe bad luck and good luck. What OP said about making bluffs in poker plays a very big part in poker, it's like manipulating your opponents next move by just simply acting that you have the high cards. This is what you called "Social Engineering" if I'm not mistaken.
Since you have Answered a Poker Thread meaning you know what's the game is and "Bad Hands,Good Hands" is the terminology use if your card is Confidently good and a Worst Bad.
That's why the topic runs on that though in Literal Word that is Bad Luck.
I've already tried applying it in so many pinch situations and it always saves me. For example is when I was still studying in college, I forgot my ID and the guard won't let me in, so I said I forgot my ID on the lab the other day, I've said that with a straight face and he let me in.
That's Not actually Bluffing instead that is LYING ,Bluff is far different from LIE..in Bluffing you are tending to Scare your opponent that you have a much better cards While in Lying you are Telling word in which might believable but still Wrong in all aspect.
and Your Lucky that i'm not your Guard because for sure i will either escort you to library to look for your ID,or I will let you take it and present to me.