merry-andrew, n. and adj. : Oxford English Dictionary
1a. A person who entertains people with antics and buffoonery; a clown; a mountebank’s assistant.
1b. In extended use: a fool, an idiot; a joker.
2. In pl. Low-quality playing cards. Also Merry Andrew playing cards. Obs.
B. adj. (attrib.).
That is or resembles a merry-andrew; characteristic of a merry-andrew; foolish.