Button is 60/12/2.2/81 and my note indicates he bluffs and semi-bluffs often to try and pick up pots. CO is 27/15/0.67/43 and plays tight postflop (WTSD 15%). Where am I on this turn?

Full Tilt Poker
Limit Holdem Ring game
Limit: $0.25/$0.5
7 players
Converter

Pre-flop: (7 players) Hero is UTG with Q A
Hero raises, 2 folds, CO calls, Button calls, 2 folds.

Flop: 3 4 8 (7.4SB, 3 players)
Hero bets, CO calls, Button calls.

Turn: T (5.2BB, 3 players)
Hero checks, CO checks, Button bets, Hero ?

Let it go. Even if you think the button is crazy, the CO didn't call your flop bet with nothing. Either player could have a T, or clubs. Or just an underpair - it doesn't matter. You've got 4 non club outs to an overpair that may lose anyways.

Fold, your out of position getting squeezed by the other two players. Heads-up i might raise button because your check suggests weakness, he prob senses this, but i would only do this with a good read on the player. Even then only use this move sparingly to avoid detection.

my advice, be careful with notes.
CO has seen the flop about 11 times.
So, we're not sure how tight he is, are we?

Now, Button has been involved in almost 50 hands it seems, so perhaps you have seen him show? some bluffs.

I would not make a play with two in the pot, when your chances to getahead, if not, are so slim.
There's a good chance the Button will call a raise with a club and then you are on the river.

risking 2 BB here to me seems like bad times against this bluffer.

What about calling down?
Well, if CO calls the turn, I'd c/f the river UI
HU, do we think Button bluffs enough to get about 7.5:2 to see SD?
Will Button check behind on river with worse hands or does he have to bluff again.
A lot of things have to go right..
I fold turn
I'm in rush, gotta get back to work.

I would lay it down, your out of position have no draws, no clubs and have 2 callers on the flop (one of which is pretty tight post flop). Regardless of the loose player u need to get away from hands like this!