What does CASUAL EJECTOR mean?

CASUAL EJECTOR meaning in Law Dictionary

In practice. The nominal defendant in an action of ejectment; so called because, by a fiction of law peculiar to that action, he is supposed to come casually or by accident upon the premises, and to turn out or eject the lawful possessor. 3 Bl. Comm. 203; 3 Steph. Comm. 070: French v. Robb. 07 N. J. Law. 200, 51 Atl. 509. 57 L. R. A. 950. 91 Am. St. Rep. 433