a rule stating that if you are more than 50 miles away from the person you are dating then all faithfulness to your significant other is null and void. Similar to out of sight out of mind.
by inspire_d March 12, 2004
Lover: I walked 5500 F***ing miles to see this girl!
Friend: Wow... You just passed the 500 mile rule! You're set for life!
Friend: Wow... You just passed the 500 mile rule! You're set for life!
by theherkman August 09, 2011
by themisfitsman May 23, 2019