what is "camp?"

The Batman TV shows are considered to be camp.

Camp is an aesthetic style in which something has appeal because of its bad taste or ironic value.

When the term first appeared in 1909, it was used to refer to ostentatious, exaggerated, affected, theatrical or effeminate behavior.

By the mid-1970s, Webster's New World Dictionary of the American Language defined it as "banality, artifice, mediocrity, or ostentation so extreme as to have perversely sophisticated appeal."

Writer Susan Sontag's 1964 essay "Notes on 'Camp'" emphasized artifice, frivolity, naïve middle-class pretentiousness and shocking excess as key elements.

Camp movies were popularized by filmmaker John Waters, including Hairspray and Polyester. Celebrities associated with camp personas include drag queens and performers such as Dame Edna, Divine, RuPaul, Boy George, and Liberace.

Camp derives from the French slang term se camper, meaning “to pose in an exaggerated fashion.”

Television shows such as Batman, CHiPs, T. J. Hooker. Gilligan's Island, and Fantasy Island, are enjoyed in the 2000s for what is now interpreted as "campy" aspects. Over-acting and bad acting are common characteristics of campy TV shows and movies. Some of these shows were developed tongue-in-cheek by their producers. TV soap operas, especially those that air in primetime, are often considered camp. The over-the-top excess of Dynasty and Dallas were popular in the 1980s. From a much earler era, Dragnet is appreciated for its campyness.

The campy aspacts of the Batman TV series include the comic book sound effect graffics, movie serial "cliffhanger"-style episode endings, the exaggerated fight scenes, Robin's "Holy-something, Batman" exclamations, the naming and labeling of gadgets ("Batextension" phone) and the naming and appearance of the villains.

(some info from Wikipedia)