There are certainly some signs suggesting that a question is not really up to the standards of MO. However, I would caution against basing decisions only on this. By contrast one can use these signs to filter for those questions that might need closer inspection as they might need to be put on hold. (Or, individually one can also decide to ignore them.)

Some signs:

1. Weird usage of tags.

2. Extremely poor/sloppy spelling and strange usage of interpunctuation marks (already in the title). (Yes, I spell badly, too, I know :-))

3. Self-agrandizing insistance on the relevance of the question, and more generally most forms of exaggeration.

Now that I try to write this I find it a bit hard to pin down the reasons. But, I know it when i see it.