What's written on Luffy's chest when he gets thrown off the boat at the end of episode 627?

My husband and i can't figure it out, or find anywhere that talks about it. It's from the peto-peto fruit filler episodes.

Sorry for the picture quality, this is the only picture that was saved.

Any ideas? Thanks a bunch!

My husband and i can't figure it out, or find anywhere that talks about it. It's from the peto-peto fruit filler episodes.

Sorry for the picture quality, this is the only picture that was saved.

Any ideas? Thanks a bunch!