a-poop,advb.phr.|əˈpuːp| [a prep.1 + poop n.] On the poop, astern. [1597J. Payne Royal Exch. 33 Steere at an ynch, or miss the haven, a fogg, at the entrans, storme and bellow on poope.]1809W. Irving Knickerb. ii. ii. (1849) 88 She..could get along very nearly as fast with the wind ahead, as a-poop.