Sham defense
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
One which is so clearly false in fact that it does not in reality involve any matter of substantial litigation. See 70 Am. Dec. 635, note.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
A false or fictitious defense, interposed in bad fnith, and manifestly untrue, insufficient, or irrelevant on its face.
Defined under Defense in Black's Law Dictionary.