Second nuts, easy fold? FU Captain Zeebo.

PokerStars No-Limit Hold'em, $1.00 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($91.50)
UTG ($74.20)
MP ($178.55)
Hero ($223.65)
SB ($91.30)

Preflop: Hero is Button with J, K.
1 fold, MP raises to $3, Hero calls $3, 2 folds.

Flop: ($7.50) A, A, K (2 players)
MP bets $4, Hero calls $4.

Turn: ($15.50) A (2 players)
MP bets $18, Hero calls $18.

River: ($51.50) T (2 players)
MP bets $153.55 (All-In), Hero folds.

Final Pot: $205.05

I didn't see how this guy got his big stack as he was at the table before I got there. He's been playing too many hands and overplaying them, for example he check-minraised the flop with top pair of tens and ended up spewing half a buy-in into someone else's KK, but this is the first time I've seen an overbet from him.

He shoved the river instantly and I folded almost as fast, I'm not even sure if my turn call was good.

I dunno, that's not a bet that wants a call... I think you have a chop here

I think that is definitely a bet that wants a call. His overbet on the turn is screaming "CALL ME WITH THE SECOND NUTS PLEASE!!!!"

I'm not calling this, stacks are too deep to call an allin hoping to split the pot.

You're calling 153 to win 25... Let him take it and steal it back later when you're more sure of your hand.