1) An alternate, safer way to address a woman about her massive exposure of cleavage. Can occur when you're in the middle of addressing them to her, and change your mind mid-sentence because:
A. You don't want to come off as a creep
B. You had an epiphany mid-sentence and suddenly realized that she can make her own decisions and it was probably her intention from the get-go to show herself off the easy way.
or C. It's a nice rack, why go spoil the party?
2) Referring to a woman's breasts to her face. Cleavage or no cleavage.
Confused? Check out the example...
Guy says to lady with massive cleavage: "I can see your.... nevermind."
That builds up awkwardness, just say: "I can see your neverminds."