Monster river overbet, call or fold?

[SlyAK]

Villain in this hand is UTG with $450. He sees the flop way too often, but doesnt get too out of line post flop in general. However, on at least 2 (maybe it was 3 occasions), he has made massive all-in overbets on the river. I dont know if this means "nuts" or just that he doesnt think anyone will call so can steal the pot.

I am UTG+1 with A [img]/images/graemlins/club.gif[/img] T [img]/images/graemlins/club.gif[/img] and $236. UTG limps, I limp, CO and button limp, both blinds come along. 6 to flop for $12.

Flop K [img]/images/graemlins/club.gif[/img] 8 [img]/images/graemlins/club.gif[/img] 2 [img]/images/graemlins/club.gif[/img]

It gets checked around. (Not sure what I was thinking here.)

Turn 9 [img]/images/graemlins/spade.gif[/img] SB bets $4, BB calls, UTG villain min-raises to $8, I raise to $20... (I'm hoping he woke up with a hand and will do the massive push here even though he hasnt done it before on the turn.) All fold back to UTG who calls. Pot= $60.

River 2 [img]/images/graemlins/spade.gif[/img]

UTG moves in!!! [img]/images/graemlins/confused.gif[/img]

Call or fold here.... I have $214 left...

Sly