A fraze once made popular by NBA Legend Shaquille O'Neil reacting to a surprisingly good performance by a current NBA Player that he never thought was able to put on the court, undermining his class up until this very point in time.
This term is now commonly used to describing a situation in which an individual (mostly male) acknowledges the fact that a (female) has been attractive and he just never noticed or was blind to this fact for other reasons, leading him to apologize using the infamous inside joke.
1.make someone an offer and give them the choice of accepting and living, or refusing and dying. Taken from "The Godfather" trilogy.
2. Same as above, but instead of killing them, you take(kill) something or someone very dear to them.
The band-leader refused to let Johnny Fontane out of his contract, so Don Corleone made him an offer he couldn't refuse.