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2.
When something has good sound quality but lacks practicality..
You see someone with a car that cost about $500 but their audio system cost $5000- "man!, Dats Boomtastic!"
by BigM4C August 11, 2011
 
1.
When something is fantastic, but you want to sound ghetto.

As Shaggy said, "I'm Mr. Boombastic say me fantastic touch me in my back she says I'm Mr
Ro...mantic "
Dude 1 - "How was the party?"
Dude 2 - "Boomtastic!"

Dude - "She is Boomtastic!"

Another word for "Boombastic"
by Michael The Bone May 25, 2005
 
3.
A word that mean absolutley and fantastically AMAZING!!! basically a word to use insted of amazingley (use Boom) and for absolutley fantastic (use tastic) BOOMTASTIC!!!
Dude 1: "WOAH!!!! that was totally Boomtastic dude!"

Dude2: "Richeous! how'd he do that?"

Street Skating Dude: "Yeah...I'm just that Boomtastic!"
by Jer-Hey! June 26, 2011
 
4.
Boomtastic is a word which is used at schools, box socials, and other functions and social gatherings, in an attempt to sound like some sort of mammal?! It can also be used instead of the word "the", but only in extreme situations.
1 - "Hey there Jacob, say, that'a a boomtastic moustache you've got there"
"I don't have a moustache"

2 - "Good one Julian! That was really boomtastic, now go get a haircut"

3 - "I went down to boomtastic shop boomtastic other day, and guess who I saw there? It was that slut from boomtastic party at Michael's house"
by Frankie Mondat May 31, 2005
 
5.
When something is really really good.
As Shaggy said, "I'm Mr. Boombastic say me fantastic touch me in my back she says I'm Mr
Ro...mantic "

Dude 1 - "How was the party?"
Dude 2 - "Boombastic!"

Dude - "She is Boombastic!"
by Michael The Bone May 25, 2005