Running/walking around in such away that it may appear that one is leaping, while making an unnecessarily wild show of doing so. particular down stairwells. there may also be obnoxious sound effects involved. it is a particularly good method for giving the major muscle groups in your legs and buttocks a good workout. watching somebody glomp around will probably look like a combination of that person trying to take the largest steps possible, as well as trying to raise his legs as high up as possible while stepping, and finally trying to slam his feet down with as much force as possible.
"dude, what's that guy doing over there? is he mental or something?"
"nah he's just glomping around. did you know its a great way to work your legs?"