a bit much

Uncommon before 1920. Possibly an ellipsis of a bit + too + much

a bit much (uncountable)

1. (informal, of undesirable behaviour) More than is reasonable; a bit too much.
   • 1996 July 27, Tara Mack, “The Super Market Man; Johnny Johnson Is Selling Pride as Well as Groceries in Richmond”, in Washington Post:

     He says sometimes people even ask him for his autograph. But that's a bit much, even for Johnny Johnson.

• (a bit too much): over the top, OTT, too