a combination of whatchamacallit and thingy. it is a replacement for any other word, it can mean anything you want it to mean and it's meaning is never the same. It can also be used as an exclamation.
Your wachingy is very large man. I am eating wachingy tonight for dinner. WACHINGY!
She is a really sweet person with 6k+ her name is Addyson! She started 11 - 10 - 2019!
Her goal is 10k she says! She makes Aesthetic videos that I love!