amateur hour
originally US
noun
(On radio, television, etc.) a time slot in which amateur entertainers are invited to perform; (also in extended use) a period characterized by a lack of professionalism; an example of amateurishness or ineptitude.
adjective
Inept, shambolic, amateurish.
Origin
1920s; earliest use found in Albuquerque (New Mexico) Morning Journal.