Spit it out
Definition 1 of 2
Pro Tip 1/3Urgency Implied
The phrase suggests impatience or urgency for someone to share information. 
Come on, we're all friends here - spit it out!
Pro Tip 2/3Colloquial Use
Used mainly in casual conversation, not in formal settings. 
During dinner, my brother told me to spit it out when I hesitated to speak.
Pro Tip 3/3Peer Pressure
Can be used by friends to encourage one another to speak freely. 
Everyone could tell she was nervous, so her friend nudged her and said, 'Spit it out.