What to do put villian on $5.50 UB

Does this villian have a made hand or pushing me and the other 2 out of the pot with a semi-bluff.

Ultimate Bet No-Limit Hold'em Tourney, Big Blind is t40 (9 handed) converter

Hero (t1430)
BB (t1290)
UTG (t1880)
UTG+1 (t1470)
MP1 (t1625)
MP2 (t1300)
MP3 (t1200)
CO (t2915)
Button (t1890)

Preflop: Hero is SB with 3[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">4 folds</font>, MP3 calls t40, <font color="#666666">1 fold</font>, Button calls t40, Hero completes, BB checks.

Flop: (t160) 2[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets t160</font>, <font color="#CC3333">BB all-in

[Solami17]

I am assuming the other 2 players folded?

Sinceyou did bet the pot, villian here may believe you are trying to steal the pot. Villian may have to overcards with a flush draw, and who is to say he is not playing this way because he was the BB. He way very well have 2x and needs to protect his hand against 3 other opponents.

This early on in a $5 tourny, though, you should still fold your hand.

if MP3 or Button called, definitely fold.

if no one calls, i still think it's a fold. there's a fair number of ways you're beat here that would be potential BB check hands, including 2x, A3, 33, 44, 55, 66.

At this stage of the SnG it's not worth taking that kind of risk. Could it just be overcards? Sure, but your stack is still in fine shape. Let it go.