bang wreck 

A term used when the sex you had with someone is so awful, it's comparable to a train wreck

After wanting to bone Sally for so long, she really disappointed me last night in bed and it was a bang wreck!

bang wreck by GlazeHer July 3, 2014

Bandwrecker 

A girl, or guy, who dates a person in the band and wrecks the band. Much like a homewrecker.

Person 1: Wow,Katrina totally ruined that band when she started going out with Kramer.

Person 2: I know! She is such a bandwrecker! I am so glad he broke up with her!

Bandwrecker by iatebandwreckers March 19, 2010