[tarheeljks]

if button always pushes and sb always just calls you are getting 185:881 ~ 20% equity, approx 20% chance of hitting. so a call seems fine at first. however, sb would only have 142, 1/6 psb, so he's probably pushing.

so if you want to see the river you are really calling the sb's 110 + 217 = 327 on the turn. so you are really getting 327 into a pot of (326 + 327 (sb)+ 327(hero) + 185(bt)= 1165. 327:1165 ~ 30% equity. so this looks like a fold.

edit: so if sb thinks button is pushing regardless, this donk bet is good b/c it makes it look like you have pretty good odds.