Webster's English Dictionary

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poop

1. poop \'pu:p\ n [MF poupe, fr. L puppis] obs  1: STERN  2: an enclosed 
   superstructure at the stern of a ship above the main deck 
2. poop vt 1: to break over the stern of  2: to ship (a sea or wave) over 
   the stern 
3. poop vb [origin unknown] slang  : to put out of breath; also : to wear 
   out : EXHAUST  slang  : to become exhausted {~ out} 
4. poop n [origin unknown] slang  : official or unofficial information