AA, facing big turn raise and river push

[Bork]

Villain's 3rd hand at the table I figured he was likely bluffing/semi-bluffing or just stupidly overplaying something I beat. I thought for a long time on the river to come to this conclusion. Thoughts?


PokerStars No-Limit Hold'em, $0.25 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

SB ($9.30)
BB ($26)
UTG ($26)
MP ($38.80)
Hero ($40.30)
Button ($25.50)

Preflop: Hero is CO with A[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $0.75</font>, Button calls $0.75, <font color="#666666">2 folds</font>.

Flop: ($1.85) 2[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $1.25</font>, Button calls $1.25.

Turn: ($4.35) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $2.75</font>, <font color="#CC3333">Button raises to $7</font>, Hero calls $4.25.

River: ($18.35) 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $16.5 (All-In)</font>, Hero calls $16.50.

Final Pot: $51.35