I show no strength, but Villain Pushes Party 600 6 Max

[tradingman123]

Party 600 NL 6 Max. I just sat down 3 orbits ago, have not seen villain get out of line. I have been playing pretty LAG and have not shown down a hand.

I (700) get dealt A/K off in MP. I open raise to 18.

Villain is only caller in BB and covers.

Flop (~ 40) K(c)/T(c)/6(s). BB cks, I bet 33. BB calls.

Turn 8(h). Ck, I ck for pot control.

River (~110) A(h), villain open pushes. I was very confused as his bet smelled very fishy (missed turn c/r would have bet for value right? is he tyring to push me out with a missed flush draw? seems like a dramatic overbet...)