25nl KK vs huge flop overbet

[Effexor]

Stacks:
SB with $17.25
BB with $30.80
UTG with $20.50
UTG+1 with $21.30
MP1 with $13.05
MP2 with $28.95
MP3 with $39.55
CO with $10.00
BTN with $27.05

Blinds: $0.00/$0.00
Site: Full Tilt Poker
Dealt to BTN:K♠ K♣
Sklansky group 1
Preflop:
1 players fold.
UTG+1 raises to $0.50
MP1 calls [$0.50]
3 players fold.
Hero raises to $1.75
2 players fold.
UTG+1 calls [$1.25]
1 players folded.
Total folds this street: 7
Potsize: $4.35
Flop:
3♣ 9♠ 6♦
UTG+1 bets [$19.55, and is all in]

Hero ?

UTG+1 is 58/21/6 over 20 hands.

 

[ChuckTs]

Hero snapcalls - this is a smaller pair/bluff/draw almost all of the time.

Do you really see him doing this with a set?

 

[SeanyJ]

58% VPIP + 6 AF = Insta-call fist pump.

I'm thinking he has top pair, or absolutely nothing.

 

[CrackaNACtion]

I htink he has top pair also. or a big draw!

 

[shinedown.45]

Insta-call here, if he had you beat preflop he would have pushed then, and a set on that board would have to be slowplayed.
He's doing this with an overpair or TPTK but have seen 2 pair in this situation, but only a complete moron would call your preflop raise with 36/39/69 suited and if the latter is the case, welcome to my world as of late.
But proper poker says call this joker

 

[Dorkus Malorkus]

100% routine call - villain's range here is basically two cards. He's a laggy spewtard, and laggy spewtards tend to adore slowplaying anything that beats KK here.

 

[Connon]

villain has pocket 10s!

i.e. fold 'coz he hits the set on the river.

 

[Effexor]

I instacalled, and afterwards I had this twinge of doubt so thats why I posted it. He flipped over AJo and my hand held up.

My thinking was that anything like a set or AA wouldn't have pushed like this.