Webster's Revised Unabridged Dictionary · 1913

Irp

Irp (ẽrp) , noun

[Etymol. uncertain.]

A fantastic grimace or contortion of the body. [Obsolete]
Smirks and irps and all affected humors. — B. Jonson

Also: Irpe

irp (ẽrp) , adjective

Making irps. [Obsolete] — B. Jonson