is this a bluff?

Midday PP
***** Hand History for Game 3598486824 *****
$25 NL Texas Hold'em - Tuesday, February 21, 19:21:54 ET 2006
Table Cetacea (Real Money)
Seat 2 is the button
Total number of players : 5
Seat 2: calihano ( $32.10 )
Seat 4: Joann377 ( $32.54 )
Seat 5: zenbitz ( $33.80 )
Seat 3: pimphustle ( $23.10 )
Seat 6: lkpearson12 ( $19.30 )
pimphustle posts small blind [$0.10].
Joann377 posts big blind [$0.25].
** Dealing down cards **
Dealt to zenbitz [ Kh 5c ]
zenbitz raises [$1].
lkpearson12 calls [$1].
calihano folds.
pimphustle folds.
Joann377 calls [$0.75].
** Dealing Flop ** [ 5d, 3d, 9c ]
Joann377 checks.
zenbitz bets [$2].
lkpearson12 calls [$2].
Joann377 folds.
** Dealing Turn ** [ Ac ]
zenbitz bets [$5].
lkpearson12 calls [$5].
** Dealing River ** [ Ts ]
zenbitz checks.
lkpearson12 is all-In [$11.30]
zenbitz folds.
lkpearson12 does not show cards.
lkpearson12 wins $27.55

Previous hand was identical, except I had top pair and he folded on turn. I have been veryloose- aggro to the point of downright awful to set up table (currently to no avail... down $5 after about 40 hands... everyone folded when I raised AK and KK)

Who set-up who?

Yeah, he was pretty new to the table. I had to go with my gut here, and my gut said he could beat a 5. but there was a non-zero chance that this was a move with air or busted draw.

Question is... how non-zero.

Probably should have bet the river, but when he called the turn I gave him credit for something.

This is a great way to swing like a monkey (or donky?) playing 6 max.

UTG, no reads, air that caught a little of the flop, building a pot on top of it all. Change your hold cards to 75o, call the river, win showdown and you have a template for a Ripptyde post.

He had called two strength-showing bets on the flop and turn. He clearly has a better hand than you. His all-in is a bit suspicious, but he may think there is a good chance you'll call it anyway, even if a value bet might have been a better move.

Ax two pair
missed draw (unlikely)

Ok youve set em all up. Now reload and play some taggy poker.