What... the FUCK?

Raise your hand if you knew "whatchamacallit" was a word. Firefox doesn't put a red line under it when I type it either, am I the only one more surprised about this word than I am about "Google" becoming a read word?

Proof

+/- Definition

n.
a name for a person or thing whose real name has been forgotten or is being avoided. : I lost my—you know—my whatchamacallit—my watch!