1. the sound of an explosion
heard a loud kablooey —often used interjectionally
Then, kablooie! A power outage shut down three big-box stores …
— Mitchell LandsbergSo what determines confidence? The actual level of debt has some influence — but it's not as if there's a red line, where you cross 90 or 100 percent of GDP and kablooie.
— Paul Krugman also an explosion or series of explosions especially when used for effect (as in a movie)
… conveying a story of corporate greed and institutional carelessness while hitting the viewer with all the taut, big-budget kablooey they can handle.
— Brad Wheeler This wasn't Gaga's party. Even through all the airborne pomp and pyrotechnic kablooey, she ultimately seemed like a guest — and one who didn't want to overstay her welcome.
— Chris Richards

2. to burst violently explode
What plays best of all, of course, is a spaceship going kablooey all over the screen.
— Tad Friend So is this something homeowners should consider? A spate of municipal water pipes going kerblooey last spring might prompt some to think so.
— David Lazarus

3. to suffer complete failure, destruction, or ruin especially in a sudden or spectacular way
One of several prize prospects of the mid-80s, he tried a comeback with the Rangers after his career went kablooey.
— Kevin Sherrington … went public … just a few months before the technology-stock bubble went kablooey.
— Scott Barancik et al.