A nonsense substitute word used when you don't know the proper term for something or simply can't remember it. Derived from "Who'd have thunk it" and "what's this?".
My car broke down and Dad has to repair the whodathunkitwhatsis to get it running again.
Who would've thought... (it/there/that/I/you/he/she...)
When something bad, and which could have easily been prevented through common sense happens.
or: who da thonk it
John and Jessica going on a trip to Antarctica (famously cold)
Jessica(not wearing a jacket): I'm so cold
John: whodathonk that it'd be cold
another term for a station wagon, mini-van, or any other kind of vehicle that is targeted at the "family" demographic(also M.A.V.)
"Tactical advantages aside, the M.A.V. is top of the line for the holy warrior troop transport manufactured by the Church of Latter Day Saints Military Industrial Complex. Also great for family trips...to heathen lands."
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.