Basically a mock on the word 'fantastic', where 'hom' stands for homo.
Can be used when someone utters an apparently sweet sentence, which can be easily confused to be a homosexual one.
Becky: "I gaze up at the sun, and I'm comforted because I know that the same sun's light is lighting your face." What do you think?

Johnny: Homtastic!

Becky: "Huh?"

Johnny: "That sounded gay, not that there is anything wrong with it."

Becky: Hey, I am a girl. I am allowed!

Johnny: Right, I forgot. Girls can get away with anything.
by Johnnyquidd December 8, 2010
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Combination of homosexual and fantastic.

Something that is fantastically gay
Dave: Did you see that pink jeep
Pete: Yeah, it was homtastic
by Shouty McShout April 11, 2005
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