Definitions by Bartholomew Swank

Fapped eyes on 

A sexual derivative of 'clapped eyes on' meaning to see someone attractive and immediately think about fapping/schlicking over them.

Example 1
Craig: I knew Mandy was the one for me the first time I fapped eyes on her.

Example 2
I just fapped eyes on the new girl at the gym, I know what I'm doing later...

Fapped eyes on by Bartholomew Swank April 23, 2013