A patch of primarily grass stain given to photographers that throw caution to the wind and get down and dirty to the earth when taking photo's outside. Mainly on the knee's of photographer's and in some cases elbows.
Person A: "Hey i see you got a Photographers Patch."
Person B: "Yeah i was really getting into my photo's today, thanks for noticing."
Person A: "Mind if you show me some of the pic's you snapped?"
Person B: "No prob ill post em' to Flickr later and you can check em' out."