1. Originating from the motion picture "FUBAR"; “Turn Down the Suck” refers to eliminating the bad, boring, or appalling elements from any situation.
2. Often used as a catchy headline to simplify ones dislike for a bad situation.
3. frequently used as a response to emphasize that you don't agree with someone or something.
Somone expresses an opinion you disagree with - "Buddy, turn down the suck" would be an appropriate response.