KK, Paired flop and a donk bet

[MadMat]

Just sat at table, so no reads on villian yet.

Interested in comments on what the flop donk-bet might mean from an unknown, and the best line to take for rest of the hand! (Yes I know I played this horribly)

Cryptologic 0.50/1.00 Hold'em <font color="#0000FF">(10 handed)</font> link

Preflop: Hero is UTG+2 with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img].
UTG calls, <font color="#666666">1 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 folds</font>, MP2 calls, <font color="#666666">5 folds</font>, UTG calls.

Flop: (8.00 SB) 5[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG bets</font>, <font color="#CC3333">Hero raises</font>, MP2 folds, UTG calls.

Turn: (6.00 BB) A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, Hero checks.

River: (6.00 BB) J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets</font>, Hero calls.

Final Pot: 8.00 BB.