Small Boat on River Facing Raise $400

Edit: Stack Sizes MP $394 Hero $444

MP and CO both Limp, I complete the SB with and the BB checks.
The Flop comes
I lead out for$12 and get called by MP.
I'm not happy to see the turn, which is the
I lead out for $40 and MP just calls. The River fills me up with the
I lead out for $100 and without much hesitation MP raises to $200.
What's my move.

wtf? shove.

easy shove... think about what his line means. He's probably not calling both the flop and turn on that drawy of a board with a set or two pair, it looks like he has a FD. The flush hits, but you have a boat so $$$$$$$$$$$

allin!! he calls with tons of worse hands

never ever fold here or not get all in if possible, ESPECIALLY when the flush hits on the river like that!

looks like an easy shove to me

I agree, easy shove. Both the turn and river gave villain lots of shots at the second best hand.

Not only did the board cooperate but the betting also makes sense. As Massimo said I can't see villain playing 2 pair or a set this way. If my opponent had flopped a set, he almost certainly would have given me action on a scary flop - and definitely on a scarier turn. If he turned two pair, I don't think there's any way he can simply flat call.