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(noun)-To kill 4 or more people with a Plasma Sword in Halo 2 in rapid succession, can also be accomplished with a Brute Shot or any other weapon, but it is much more difficult.

Performing a whacktacular proves you are a top of the line player
Holy hell, I just overboarded every single one of those bitches with my sword, what a whacktacular!
by Brian H November 11, 2004
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2
adj. - describing any person, place or thing contributing to pleasurable and vigorous masturbatory experience.
I had a whacktacular weekend perusing volumes of electronic and paperback pornography!
by Tom Zappacosta September 27, 2003
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3
(N)Any person, place, or thing. that is gay, or stupid beyond normal standards.
That new Ja Rule song is Whacktacular.
by John Puopolo March 28, 2005
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