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'
by Tomster@Lyon November 08, 2013