This must be why I suck at poker. I don't get this at all.

Why are we shoving here?

The guy called two good size raises from the SB. Even with his stats, it's hard to put him on any unpaired hand containing two clubs. It's also hard to put him on a big pair since he didn't 3-bet himself.

My read here is that he either has something like 88-TT, or some kind of Ace. The aces and 99 are definitely going to call if we shove.

It looks to me like his check on the flop could only be 1) a trap or 2) a surrender.

Why not just throw in a bet of $60 - $80. If we get check raised, we're most likely drawing to two outs and can fold. If he has nothing he'll fold and we risked less to find out that he has nothing good.