Heavage

The act of shoving one's cleavage in another's face. The culprit generally pretends that the act is accidental, though she is conscious of the sexual alarms that ring in others at the sight of large semi-exposed breasts (to make an impact, the cleavage must be pronounced) in our faces.

I noticed Gemma over by your supervisor's desk. She dropped her pen on his chair, literally said "oops" then bent down to give him a full two-second heavage. I guess I know who’s getting that promotion."