rectal rummager 

One who explores another person's anus, with fingers, penis, or other instrument with such enthusiasm as if they were rummaging around for something in there. Also used as a playful insult of a friend, like calling them a penile perpetrator, fgt, or scrotum soldier.

"STFU you rectal rummager! I heard bout what you did to that other guy when you were drunk at the party, you fgt!"

rectal rummager by bigjimdx June 1, 2005