v stake a claim for something in the same way that Americans would claim “dibbs” on or “call” some item or privilege: I bagsie the front seat or Bagsie first shot on the dodgems! It’s a rather childlike sentiment; you would be less likely to hear I bagsie being Financial Director! It doesn’t seem ridiculously far-fetched that it’d be derived from “bags I,” with “bag” meaning to catch something. But hey, who can tell. [Etymologists. –ed.]