We found one dictionary that defines the word what-d'ye-call-'em:

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1. what-d'ye-call-'em: Wiktionary

Definitions from Wiktionary (what-d'ye-call-'em) ▸ noun:  (dated) whatchamacallit ▸ Words similar to what-d'ye-call-'em ▸ Usage examples for what-d'ye-call-'em ▸ Idioms related to what-d'ye-call-'em ▸ Wikipedia articles (New!) ▸ Popular adjectives describing what-d'ye-call-'em ▸ Words that often appear near what-d'ye-call-'em ▸ Rhymes of what-d'ye-call-'em ▸ Invented words related to what-d'ye-call-'em