Source : Webster's Revised Unabridged Dictionary (1913)

Irp \Irp\, Irpe \Irpe\, n. [Etymol. uncertain.]
   A fantastic grimace or contortion of the body. [Obs.]

         Smirks and irps and all affected humors. --B. Jonson.

Irp \Irp\, a.
   Making irps. [Obs.] --B. Jonson.