E.T. Necking

E.T. (The Extra Terrestrial) had a long neck and a large head. When someone stretches their neck and their head blocks your view.

"I can't see because you are E.T. Necking!"

As your friend looks out the window and says "Check out that girl over there!" and you cant see past his head because he is E.T. Necking and you miss the view.