when you fuck a bird in the asshole.
many people "purp" to relieve stress and symptoms of severe pregnancy.
when you "purp" you also use naval oranges to balance the birds weight inside of your vagina, or penial areas, if you're into that crazy shit.
if you're "strickly dickly" you must use a bird whom has a penis and use their penis as their asshole, for it to be proper "purping".
many people use "purping" , however, if they fuck the bird, and someone see's them, that person will probably call the humane society.

please look up the definition for "sea-gulling" to properly execute true "purping" statistics.

When you eat dirt for the first time and leave your family to build a shack in the woods