(slang, interrogatory) what do you say

(informal) A person whose name is either unknown or forgotten

(chiefly UK) A thing (used in a vague way to refer to something whose name one cannot recall, or that one is embarrassed to say)

plural of whatsit

(slang) plural of whatshisname People whose names are either unknown or forgotten

(colloquial) A placeholder for the name of a woman whose name the speaker can not bring to mind.

(colloquial) A placeholder for the name of a man whose name the speaker cannot remember.

Any object whose name one does not know or cannot remember.

Any object whose actual name one does not know or cannot remember.

Any object whose name one does not know or cannot remember or immediately bring to mind.