Eye Bumming 

When a man's eyes linger too long on a ladies bottom, he is said to be 'eye bumming' her.

A lady walks past a man in the street, the man turns to check the ladies bottom out as she passes. The man is then 'eye bumming' the lady, or violating her with his beady eyes, and can legitimately be referred to as a 'eye bummer' from then on. The unfortunate lady has been 'eye bummed'

Eye Bumming by Tomster@Lyon November 8, 2013

Eye bumsing 

Fucking someone just using your gaze. From the German word "bummsen" for fucking

...and i love the way you were eye bumsing me arrrgh, turns me on actually just thinking about it😊.

Eye bumsing by Nenn_mich_Franz January 8, 2016