Another use is when you get one over your mates at some sort of game.
Example 1: During a careers talk
James: I want to be an Astronaut Miss...
He is now smug
Miss: Your too fat to be an Astronaut
Andy: You just got Mercked Mate !!! Awww good and proper.
Example 2:
James walks into the room, little does he know that a bucket of water has been suspended on the door-
James is soaked
Andy: Awww you been Mercked matey!
Example 3:
When playing a video game , sports or shoot em ups work best.
James: I m gonna win this game easy
Andy scores a wicked goal in the last minute of Extra time and avoids penalties
Andy: You been mercked , nuff said
A 1. (A man is playing football and is hit so hard that his helmet was knocked off)
Teammate- "You got mercked, dude"
A 2. (A pair of boys are arguing over a girl.)
Boy #1- "Dude, stop hitting on my girl!"
Boy #2- "Man, I gave that girl the clap, have fun with that!"
Bystander- "Mercked."
A 3. (A boy is picking on a weaker child)
Boy- "Look at how small you are! I can hardly see you, little guy!"
Weaker boy- "That's not what your mom said last night!"
Bystander- "Mercked."
B./C. (A man is walking around aimlessly. He sees a friend of his.)
Friend- "Hey man! I think I saw you at a party last weekend!"
Walker- "Man, I went to that party and got so mercked."
a verb:
to insult or publicly humiliate someone verbally or otherwise. to make fun of someone. (this definition may be local to DC region)
used similarly to "fry" "own" "jone" "pwn"