Grenade Stick

From Halopedia, the Halo wiki

Stick It Medal.gif

The Stick It Medal is awarded for killing an opponent by sticking a Plasma Grenade to them. It is available in all Multiplayer gametypes and has a Bungie difficulty rating of 3 (out of 10). It is represented by a bronze star with and blue star in it and a blue sphere in that. After you kill an opponent by sticking a Plasma Grenade to them, a message appears on your screen that says: "You stuck (player)".