Source : Webster's Revised Unabridged Dictionary (1913)

Pooping \Poop"ing\, n. (Naut.)
   The act or shock of striking a vessel's stern by a following
   wave or vessel.

Poop \Poop\, v. i. [imp. & p. p. {Pooped}; p. pr. & vb. n.
   {Pooping}.] [Cf. D. poepen. See {Pop}.]
   To make a noise; to pop; also, to break wind.