Verb 1. Hitting on a girl so hard that no one else can even get close to her, esp. when you have absolutely no chance. 2. The ultimate form of cockblocking.
Things were going well with Tracy until Steve gotdrunk and started stacking on her. What a buddy fucker.
Noun 1. The girl in the group who cockblocks you just when you think you are going to score. She is usually big and mean and possibly bald. See also mother hen.
I had this chick at the bar drunk and ready to go, but then this Urlacher showed up and cockblocked me.