The Collaborative International Dictionary of English v.0.48:

Titivate \Tit"i*vate\, Tittivate \Tit"ti*vate\
   (t[i^]t"[i^]*v[=a]t), v. t. & i. [imp. & p. p. Titivated
   (t[i^]t"[i^]*v[=a]t`[e^]d); p. pr. & vb. n. Titivating
   (t[i^]t"[i^]*v[=a]t`[i^]ng).] [Formed from an uncertain
   source, in imitation of words in -ate fr. L.]
   To dress or smarten up; to spruce. -- Tit`i*va"tion,
   Tit`ti*va"tion, n. [Both Humorous]

         "Come here, an' let me titivate you." He sat down
         beside her, and submitted to be dusted.
                                                  --Quiller-Couch.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

tittivate
    v 1: make neat, smart, or trim; "Spruce up your house for
         Spring"; "titivate the child" [syn: spruce up, spruce,
         titivate, tittivate, smarten up, slick up, spiff
         up]