Definitions by Sliperyspangel

Dirty periscope 

When another inserts their head into the anus of another male or female and bites down on the lining of the anus

Person 1: Hey baby, fancy a dirty periscope?
Person 2: I would love you to give me a dirty periscope.

Dirty periscope by Sliperyspangel August 20, 2015