When you get paranoid from the littlest thing; another term for a bitch. Can also be used as a term for a snitch, or someone who cheats away your money.
Paul: I Drank way too many 5 Hour Energys, call 911!
Chad: Calm down dude, don't gery man!
Dev: Yo dude, that guy just geryed me out of my weed man.
Dan: Dude, go pop his tires!