To pour a bump of coke on the fleshy part of an uncircumcised penis that covers the tip. The Penis cannot be erect as when the cocaine is being snorted some of the flesh must be able to enter the plain of the nostril.
"jesus my penis hurts."
"we were meatsnuffing all night last night."
When an uncircumcised man puts a small amount of cocaine on the tip of his penis where the flesh meets and a person proceeds to snort as hard as possible ingesting the cocaine and having some flesh up his nose for a second.
"Hey Bra Chelsea is down with meatsnuffing."