Expression used by the X-ticles in the tv show "Frisky Dingo" to express awesomeness. Sometimes in intense cases it can even be modified to "BA-BA-BOOSH" and can be used in daily life during instances of pwnage or other extreme craziness.

boosh {bʷuːʃʷ} {bʷuwʃʷ}

1: Onomatopoetic word mimicking the sound of a cannon firing or a large mass splashing down into water. Popularized by the 2006 cartoon Frisky Dingo. Used to express awesomeness, to punctuate reality when situations call for it.

Appropriate for pwnage, victoriousness, excitement, physical collisions, mental collisions, being dumbstruck, awestruck, firing weapons, explosions... can also be used ironically, turned around when suffering extreme defeat, being pwned etc.

Appropriate to be used be a 3rd party not directly involved in the situation, but in witness to it, or hearing about it later.

Sometimes expanded to "ba-ba-boosh" when just one boosh isn't enough for the situation.

2: (much less likely) reference to The Mighty Boosh, a British comedy troupe, or their television show of the same name... you know, the one with Old Gregg: "I'm Old Gregg!! I got a man-gina!"

A word used to express extreme, amazing awesomeness/wickedness. Taken from the show "Frisky Dingo" on Adult Swim.

Boosh

interj., verb

1. Exclamation most commonly associated with pedophiliac tendencies. Phrase may be used bi-directionally.

2. Phrase used to describe the sensation of warm cum flowing over the face and chest.

3. A type of rapid, illicit man/boy love.

The master of awesome.
Someone who is so totally amazing that he deserves this title.

It literally means "Grandma" in Russian.
The reason I bring this up, is because Americans tend to mispronounce the word.
It should be BAH-bushka, not ba-BOOSH-ka.

a word with many meanings, depending how you use it in what context, it either means something really wrong or great.