sick burn 

to insult someone on an elevated level; to put someone down to the lowest; usual victims of a "sick burn" will be the guy in your school who tucks his plaid shirt into his pants and clips a cell phone on his belt

a good way to know if you've been sick burned is that whoever has burned you will immidiatly shape his hands like two guns and immitate blowing the smoke off them on at a time and will say in a baratone voice : "sick burn", possibly with a clever smirk on his face.. you must have a mustache and a red leather jacket to sick burn someone

Bobby: "Hey Jimmy, wanna go for a ride"

Jimmy: "Yeah,.... on your MOOOMMMM.."
Jimmy: "Oh.... sick burn"

sick burn by Matt Lejeune September 28, 2006

Sick Burn 

To burn someone on an epic level.

1. Buying a plane ticket for your girl-friend to come and visit with you over the summer last year, and she never shows up. $400
2. Buying a 2nd plane ticket for your girl-friend to come and visit you over summer this year, she finally shows up. $400
3. Paying for her meals, alcohol, theme park ticket, movie ticket and taking a day off work to spend with her over a 3-day weekend. $350
4. Finding out she wont have sex with you because she is gay. Free
5. Finding out she took the 2 dollars you left her for bus fair to take the bus to the grey hound and go back home to Oklahoma while you were at work. Priceless + 2 dollars.
SICK BURN!
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Joe: Did you hear what paula did to travis?
Bob: Yeah man, she totally left him a note on his bed while he was at work and when he got home he finds that she was not there anymore, he read the note and it said, "going back to Oklahoma, sick burn"

Sick Burn by Travisty in Spokane July 6, 2007