Alternative form of whatchacallit

Ellipsis of Whatcom Falls.; A waterfall in Bellingham, Whatcom County, Washington, United States / Ellipsis of Whatcom Creek.; A creek in Whatcom County, Washington, United States

(interrogative) What ever; emphatic form of 'what'. / Regardless of the ... that; for any ... that. / Any ... that; of no matter what type or kind that. / Any; of no matter what type or kind.

(with negative) At all; in any way; whatsoever. / (interrogative) In what way; to what extent.

(colloquial) A holophrastic expression used to dismiss something that the speaker doesn't care about, doesn't think important, or doesn't want to consider or discuss any further.

(colloquial) Unexceptional or unimportant; blah.

(colloquial) Something whose exact kind or nature is unimportant; a thingy.

(slang) A metasyntactic term used for any object whose actual name the speaker does not know or cannot remember; a doodad, gizmo, thingamajig, thingy.

a whatchamacallit

(informal) Something one does not know the name of.