A Glackin
In the game fifa world cup your on a clear breakaway, but you instead pass it back to the next guy running down the field to strike the ball in the goal. Such as a one timer in hockey. It takes away from the legitmacy of the goal.
"Dude you dick you just pulled a glackin you could have just scored with the first guy. Dick."
Glackin
A God, a Juggernaut, and a beast. Usually a massive middle-aged teacher with long facial hair who looks like he can strangle a bear with his pinky.
Oh god, it's a glackin!