[jba]

villain is generally weak postflop. he will check behind AK unimproved on the turn almost always - unless he checks behind on the flop (but remember AK is highly discounted). he will check behind the flop or turn if an overcard hits. he'll showdown big pairs almost always.

he will bet overpairs on the flop and turn unless the board gets very scary (like four flush/straight). he'll check behind tons of rivers even when it's AA is an overwhelming favorite - like whenever the top card pairs or three to a flush are in.

also the fact that he offers this deal does not indicate a weak hand in any way. he's the type to say stuff like "if you don't have a club you're drawing dead" or "aces no good" and be telling the truth 100% of the time.