tricky spot vs a spewtard

ive only played ~70 hands with villain, but no stats because im at work.
Villain has shown down 2nd pair meh kicker in several medium sized pots (50bbs). Ive built all of my stack off him. Ive been isolating him alot and he has called c-bets with TPWK, 2nd and 3rd pair type hands. Hes also led out flops and turns. I raised a weak flop bet he made earlier and he led out the turn again with 99 on a xxJ board. Hes never led out like this in a 3-bet pot, although he did call a c-bet in a 3-bet pot when i whiffed.

wtf do i do here? Push or fold obv, but what the hell is he doing this with?

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

saw flop|saw showdown

SB ($103.05)
BB ($44.90)
UTG ($6.90)
MP ($162.20)
Hero ($162.25)
Button ($102)

Preflop: Hero is CO with Khttp://www.flopturnriver.com/phpBB2/...iles/spade.gif, Ahttp://www.flopturnriver.com/phpBB2/...iles/heart.gif.
UTG raises to $6.9, MP calls $6.90, Hero raises to $29, 3 folds, MP calls $22.10.

Flop: ($66.40) Thttp://www.flopturnriver.com/phpBB2/...miles/club.gif, Khttp://www.flopturnriver.com/phpBB2/...iles/heart.gif, 9http://www.flopturnriver.com/phpBB2/...iles/spade.gif (3 players)
MP bets $40, [color=#CC3333]Hero ???

well he definitely isn't doing this with 2 pair or QJ unless he is a super donkey calling that huge 3 bet with those hands. You would think a set would check there, because of that flop. I just can't this as anything other than a donk lead with KQ, JJ, QQ. Also AK is a strong possibility. I would say shove.

Shove this; this is most likely a pair and a straight draw. I don't think he is good enough to bet a big hand here. Calling is dumb and folding is too weak. Shoving isn't great, but it is the best play.

he sounds real bad...will often have worse hands like KJ...it's just a cooler if ur beat.

from what i understand this guy leads out with stupid stuff. that has to mean his leading range is rather wide open. therefore, its prolly a shove.

but he's so bad, QJ wouldnt surprise me in the least, either. youre far enough ahead, though, if it is...oh well.

like i said, ive seen him lead out before, but it was weak bets. Ive never seen him lead for 2/3 pot in a multiway 3-bet pot. Im still not sure what the best play is here. Usually TPTK is the nuts in a 3-bet pot, but 160bbs deep against such a strong lead im not sure.