A shady, weasely person, possibly small in stature, that looks for any opportunity to steal articles such as: lighters, food, alcoholic beverages, pipes and anything that will get you f*cked up.
"Damn, Fred drank 18 beers out of my 30 pack, and he only threw down 2 bones . . . f*ckin mouseclopter!"
"Hey Gerald, where'd you get that cool pipe?" "Oh, I mousecloptered it from Billy."