The Collaborative International Dictionary of English v.0.48:

Keck \Keck\ (k[e^]k), v. i. [imp. & p. p. Kecked; p. pr. & vb.
   n. Kecking.] [Cf. dial. G. k["o]cken, k["o]ken.]
   To heave or to retch, as in an effort to vomit. [R.] --Swift.
   [1913 Webster]