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1.
1. Trying to get someone to tell you their secret; can also be used if person is stuttering

2. used to get information off someone
come on, spit it out
by The Voice January 20, 2003
 
2.
A pretty awesome rap-metal song from the band Slipknot. It was the second single off of their debut album "Slipknot". If you read the lyrics, they are obviously about anger and arguments.
SPIT IT OUT!!! All you wanna do is drag me down, all I wanna do is stamp you out!
by MetalHead16 December 10, 2010