A word often used to describe dangerous dog breeds such as Bullterriers (Pitbull, Stafford) and Mastiffs (Rottweiler, Dogo Argentino, Boerboel) because they tend to have large jaws, sharp teeth and muscular bodies, which goes with the ability to severely injure and kill other humans and animals.
"My crappy neighbour recently bought an American Pitbull Terrier, the jaw was so huge that it reminded me of some kind of land shark. I heard they kill more people than all other breeds combined!"
A verocious animal that "kills" you when you die in a very embarrassing way, such as falling off of a cliff, or blowing yourself up; on a game like Fortnite or other team based games.
Teammate 1: "Dude what happened? Who knocked you?"
Teammate 2: "It was another land shark."
Teammate 1: "Bro you suck ass at this game."