The Collaborative International Dictionary of English v.0.48:

Drawl \Drawl\, v. t. [imp. & p. p. Drawled; p. pr. & vb. n.
   Drawling.] [Prob. fr. draw: cf. D. dralen to linger, tarry,
   Icel. dralla to loiter. See Draw, and cf. Draggle.]
   To utter in a slow, lengthened tone.
   [1913 Webster]