Penispenispenispenispenis is a term used to describe an internet trolling phenomenon in which the word "penis" or synonyms (e.g. dick, cock) are used in some way or another to cause mischief. Apparently many internet trolls find the word inherently amusing and therefore like to post it as much as possible while trolling websites. It is also used by American football fans as a chant when the other team converts a third down as a way to express frustration.