To make a small gesture with one's hands -- turning them outward, slightly, so that the palms are nearly face up -- indicating one's innocence of any wrongdoing or ill intention.
face up, more or less To turn one's hands outward, slightly, with the palms more or less facing up: a gesture
From a prose adaptation of David Mamet's Glengarry Glen Ross:
"...how are you?" Ricky asked, finally noticing George's agitation.
"Fine," George preoccuplied. "You mean the board...? How am I doing on the board?"
"Okay," Ricky said, shrugdicating. "The board."
"I'm fucked on the board!"