The Collaborative International Dictionary of English v.0.48:

Pout \Pout\ (pout), v. i. [imp. & p. p. Pouted; p. pr. & vb.
   n. Pouting.] [OE. pouten, of uncertain origin; cf. Prov.
   pot lip, Prov. F. potte, faire la potte to pout, W. pwdu to
   pout, be sullen, poten, potten, a paunch, belly.]
   1. To thrust out the lips, as in sullenness or displeasure;
      hence, to look sullen.
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            Thou poutest upon thy fortune and thy love. --Shak.
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   2. To protrude. "Pouting lips." --Dryden.
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