A very important factor to consider is your position and opponents positions, considering you said UTG shipped and 2 others called before you, I'm assuming you are either in the blinds or in late position, in which case you have to fold as K9o is not strong enough to play without fold
equity against 3 other players.
Even if you get a weaker hand like Q9s the next hand, if you get to shove, it is a more profitable play(might not be
a profitable play, depending on position but relative to calling with the K9o, it is a
more profitable play).
The only time you are calling any 2 cards is if you have <2bb and are on the blinds. Even then you might find a few folds if you are the SB. It is not profitable to call any 2 cards against hands that open for the reason that they have a hand they like and thus the hand is strong where is you likely have a random crap hand. So unless you are getting extremely good odds(doesn't happen unless you are super short and on the blinds), you never call an all in with any 2 cards.
As for pushing with any 2, there are a couple situations.
When you are on the BTN/SB and the blinds/BB is extremely tight and fold way more than they should, then it becomes profitable to jam any 2 cards if the stacks are shallow enough.
Another is when you are UTG and extremely short say at most 6bb stack and the blinds are going up in the next minute, ie if the hand plays out all the way chances are your 6bb stack becomes something like 5bb or possibly even a 3 or 4 bb stack in turbo.
Rather than thinking of when to play any 2 cards when short stacked, I think it is more important to realise when there is a very low chance of getting a more profitable spot that you have no choice but to shove your current hand. What I mean is that even if you have to make a losing play, if folding means you have a very high chance of having to do plays that will lose more, in the long run, it is +EV to do the less losing play. Although your EV can no longer be positive in the situation, you have to make the correct decision of going with a less negative EV play. This is the reason why you are forced to shove wider and wider as your stack grows shorter and shorter in tournament play. Hope you understand what I mean don't know how to explain it clearer I'm bad with words.
