JACKRABBIT START ... The sudden acceleration of a motor vehicle from a standing stop. ... The analogy is to a jackrabbit (q.v.) leaping suddenly from cover and bounding quickly away when disturbed by a dog or a hunter.

Judging from the on-line discussion of these types of events both before and after, the fat site users aren't just a damp bunch of pasty-skinned computer geeks whose only light is the flicker of their monitors; they're as physically active and bold (and, of course, sometimes as couch-potatoey and mild) as they are online.

we have some vindictive people as bosses, and you don’t want to be the target of their wrath.

The morning brought an increased swell; long, perfect, down-the-line, 6-8' freight trains — a forehander's dream and a backhander's nightmare