Source : Webster's Revised Unabridged Dictionary (1913)

Vamose \Va*mose"\, v. i. & t. [Sp. vamos let us go.]
   To depart quickly; to depart from. [Written also {vamos}, and
   {vamoose}.] [Slang, Eng. & U. S.]

Source : WordNet®

vamoose
     v : leave suddenly; "She persuaded him to decamp"; "skip town"
         [syn: {decamp}, {skip}]