In Starcraft expansion pack(Starcraft:Brood Wars) there is a unit called a Dark Templar. These units are usually called zeretul's because in the game there is a Dark Templar named Zeretul who is a very important person, so people are too lazy to find out the real name and they just call them zeretul's.
"Yo Ted, stop building zeretul's and build some reaper's!"
"John, for the last time they're called Derk Templar!!