Other forms: campily
Use the adjective campy to describe something that has a ridiculous, wacky appeal. Some movies are so exaggeratedly bad that they've got a campy kind of charm.
Anything you describe as "so bad it's good" is probably campy. Many fans of over-the-top, campy films like The Rocky Horror Picture Show, for example, find them wonderfully funny and strange. The early 20th-century slang meaning of camp was simply "tasteless," with campy emerging in the late 1950s. The root is uncertain, but it may be the French se camper, "to put oneself in a bold, provocative pose."