The Collaborative International Dictionary of English v.0.48:
Cullion \Cul"lion\ (k?l"y?n), n. [OF. couillon, coillon, F. co?on, a vile fellow, coward, dupe, from OF. couillon, coillon, testicle, fr. il the scrotum, fr. L. coleus a leather bag, the scrotum.] A mean wretch; a base fellow; a poltroon; a scullion. "Away, base cullions." --Shak. [1913 Webster]