(adjective) word Cool, highly impressive, intricate, unusual or (for a person) someone savvy & canny.
Outdated slang (by the 1990s) for a person or gadget. "Whiz" as abbreviation for "wizard", i.e. indicating the Wizard of Oz with his lightshows and gadgets.
He's the whiz kid! (the wonder kid)
That new multi-function toy is really whiz!
“I twisted the dilly-doo until the thingy lined up with the whosie-whatsit and wouldn’t ya know it. The dingus got all gashnitzed and gashnizzled and the jobby-joo went wizz-bang out the back. Please forgive me if I’m getting too technical for you. It’s just that I’ve been workin’ in the doojigger biz since I was knee-high to a whatchamacallit and I rarely interact with you civilians.”