By Definition.

According to Websters Dictionary-

Main Entry: projectile vom·it·ing
Pronunciation: \-ˈvä-mə-tiŋ\
Function: noun
Date: 1862
-vomiting that is sudden and so vigorous that the vomitus is forcefully projected to a distance.

But I think they missed a few key points. Such as:

-may happen at an inopportune time. Like five minutes before your child needs to be in his kindergarten classroom.
-may seep deeply into the cracks and crevices of your hardwood floors. This will most definitely cause odor for months to come
-may quite possibly splash up the sides of your baseboards and/or sofa.
-you may leave to get more paper towels and return to find your dog picking out the chunks of hot dog and eating them.
-may happen when you are wearing the only pair of clean jeans you own. You may (inevitably) kneel in vomit.
-may cause surrounding children to marvel....then dry heave shortly thereafter. This will cause the mother to panic and yell.
-may happen the very day your husband left for Pittsburgh on business.

And last, but not least -

-If you are Amy Olivas, all possibilities listed above WILL happen.