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1.
an inferior position (see also play second fiddle)
He hated the idea of playing second fiddle to his rival.
by Light Joker July 23, 2005
 
2.
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.
by moon doggie April 27, 2003
 
3.
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.
by minkuspinkus March 08, 2011