What is whatchamacallit?

Some articles on whatchamacallit:

Whatchamacallit (candy)
... Whatchamacallit is a candy bar marketed in the United States by The Hershey Company ... The "Whatchamacallit" name was devised by Harrison F ... Since 1987, Whatchamacallit has included peanut-flavored crisp that utilizes peanut butter as the flavoring agent, with a layer of caramel and a layer of milk chocolate ...
Erika Mustermann - Hungarian
... izé whatchamacallit (noun), izés whatchamacallit-ish (adjective), izébb or izésebb more whatchamacallit(ish) (comparative adjective), izésen in a whatchamacallitish manner (adverb), izél ...