1. One who persues anal sex for sexual pleasure or curiosity.
2. A homosexual male.
3. A proctologist.
This term may have come about after the likes of 2005's Brokeback Mountain--a film that depicts gay sex as a more pastoral undertaking.
"Rectal Ranger" can first be sited in 2005's Pretty Persuasion soon after Brokeback Mountains debut:
"These teachers, you know, hear it--these fucking dykes, lesbians, these feminists in the school system with their rectal-ranger buddies, you know; 'oh, it's the parents' fault, it's the upbringing.' Right. As if, what, kids couldn't inherently be fucking complete assholes on their own?"
Bob: "...shut up...we don't have sex."