fantastic and ballistic are combined together. This refers to when someone gets so excited about
something they love, they go ballistic over it! This
may include jumping up and down wildly, screaming at the
top of ones lungs, hugging everyone in the near vicinity even if they are perfect strangers, pretty much temporary insanity.
The
cheerleading team were so excited when they made the final
cut at the competition that they went into a fantaballistic fit of simultanious spasms, somewhat like a mosh pit on a
trampoline.