GR translation: jingling his gastric jewelry

[Mike Jing]

P244.7-14  Bounce stares at him, jingling his gastric jewelry, not knowing
what to make of Slothrop, exactly.
“I mean,” Slothrop now working himself into a fuss over something that only
disturbs him, dimly, nothing to kick up a row over, is it? “doesn’t it
strike you as just a bit odd, you Shell chaps working on your liquid engine
your side of the Channel you know, and their chaps firing their bloody
things at you with your own . . . blasted . . . Shell transmitter tower,
you see.”

What exactly is his "gastric jewelry"?  Or does this mean something else
entirely?
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