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2.
When one mid-sex takes an inanimate object (lamps being the norm) and hits their partner in the head to the point of concussion, the man then keeps going until satisfaction.

The woman then wakes up the next morning having no recollection of what happened.
Anthony: Hey franco, remember a while back when i gave that girl a silent night.
Franco: Yeah! How Could I ever Forget.
Anthony: Well i saw her yesterday and ran.
Franco: why?
Anthony: She was pregnant.
by Brad Sutty May 03, 2007
 
1.
To have sex with someone discretely; implying that no one knows that you have done it-- it stays silent between everyone who wasn't the person you did.
Michelle totally had a Silent Night, but she kept denying it.
by whaluu April 25, 2014