6max, NL4 (eur). 5 players at the table, I have about 3.70eur. Just lost a buy in on pair v pair.

I have AQo on the button, 1 limper. I make it 0.20, sb calls. sb has me covered. sb is pretty donky, but I haven't seen him playing much. I saw him calling 20c on the flop and 40c o the turn with bottom pair.
I miss the flop, it comes 963o. He checks to me and I decide to check back, because I'm sure he would call my c-bet anyway.
Turn is a 10. He quickly fired pot size bet 0.40. Now I'm just angry because I lost 2 or 3 small pots to him like that. I don't really believe him so I call to see what he does on the river.
River is a 9 and he bets 0.28. No I'm sensing weakness here, so I put him on like A3 or something like that. I go allin.
Was that a smart move? Is it EV+ to make plays like that even if I'm pretty sure he is weak?

Don't bluff at micro limits. Pretty much ever.

You might think he's weak, but he might think you are tilting and bluffing.

No.

you do realise that A3 beats you and that at the 4NL A3 is likely to still call you. You don't win money bluffing like this at the micros, especially the nanostakes, you win it by actually having a hand and having them call you with trash when you have them crushed. They will call you down with trash so don't bluff them if you can't even beat trash.