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

It’s an acronym standing for Can’t Remember A Fucking Thing. It’s usually used to describe embarrassment at being unable to remember someone (CRAFT moment); going onstage as the lead in the latest theatrical performance and your mind goes completely blank (CRAFT situation); the next morning after a night when you got pissed as a fart and woke up in bed cuddling a traffic cone and a string of fairy lights wound round your prick.

A loud noise heard with an explosion.

When some one becomes outraged at the actions of another suddenly and without warning.

Term used to describe, When you go to fire your weapon and it explodes.

a hardhitting advertisement that creates a buzz, an attention grabber that really gets people talking

Name of a controversial flash game depicting a suicide bomber.