The larger version of boom
Boom is just a "boom" while KAboom refers to the "WOW" effect verison of boom. Something truly boom
, becomes kaboom.
Can sometimes be written with multiple "o"'s such as: kabooooooom.
Meaning an even larger boom than kaboom.
Usually said with a special voice or sounds. Putting weight on the "o"s.
ps: if you actually say this, you might be considered a retard
as it sounds pretty stupid saying this.
Also an onomatopoeia
of a huge explosion