The Collaborative International Dictionary of English v.0.48:

Stulp \Stulp\, n. [Cf. Icel. st[=o]lpi, Dan., Sw., & OD.
   stolpe.]
   A short, stout post used for any purpose, a to mark a
   boundary. [Prov. Eng.] --Halliwell.
   [1913 Webster]