You understood it? Are you Irish? I'm Murkin and I thought it meant running one out from his pocket or something.
Peel a banana in his pocket: Tight-fisted, cheap. Often the phrase is “peel an orange in his pocket.” The idea is that someone is so cheap, he will peel a piece of fruit inside his pocket so no one will see it and ask for a bite. - Don’t Be a Muggins: Learn Some Irish Slang