$100NL 6-max @ FT

villain limps SB. i check in the BB.

the past 2 times he has limped his SB, i've raised in the BB. both times he's called. one time he overbet check-shoved an A99 flop and i folded, the other time he donked a K55 flop and 3-bet shoved over my raise.

i obviously have a strong suspicion that he's a retard and just trying to fuck with me. however it is possible that he's a retard who is catching big hands and likes to overbet-shove them. i have not seen him before and do not have more than 30 hands logged at this table with him.

flop is 543 rainbow. he checks, i bet $2, he check-shoves for 100bb more.

what's your calling range here?