Definition: the word which replaces the words : thingy, thing-a-ma-jig, etc
Uses: used to replace the name of something you forgot. Example "Hey, can you go grab that Whichadidger on the counter?" Or "You dropped the Whichadidger in the tub?"
Go to the Whichadidger and grab me a beer. Whichadidger would be used for the wordFridge.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.