The Collaborative International Dictionary of English v.0.48:

Versemonger \Verse"mon`ger\ (v[~e]rs"m[u^][ng]`g[~e]r), n.
   A writer of verses; especially, a writer of commonplace
   poetry; a poetaster; a rhymer; -- used humorously or in
   contempt.
   [1913 Webster]