The style and manners of a macaroni; dandyism. See macaroni, 3. (noun)
The Century Dictionary (Public Domain)
Use "macaronism" in a sentence
"She must have some grand qualities, this Pani P., since she has managed to steer her life through so many difficulties, and at the same time educated her daughter so well; but she is clumsy and tedious with her headaches and her macaronism."
"We would have thought it vile poltroonery and macaronism to have worn wigs -- to say nothing of powder -- unless, indeed, the peruke was a true Malplaquet club or Dettingen scratch."