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.