second fiddle 

an inferior position (see also play second fiddle)

He hated the idea of playing second fiddle to his rival.

second fiddle by Light Joker August 16, 2005

second fiddle 

Ones back-up girlfriend/boyfriend.

No song is as sad as the song of the second fiddle. (OR) She was being played as his second fiddle.

second fiddle by moon doggie April 27, 2003

second fiddle 

n. The second girl in a threesome who is getting fingered but not screwed.

My girlfriend and I had a threesome, but the one rule was that the other girl had to be second fiddle.

second fiddle by minkuspinkus March 24, 2011