One person (male or female) coats his/her anus with peanut butter. A man then penetrates, performing anal sex with the peanut-butter-clad person. Next, the first person sucks the peanut butter (and whatever else) off the man.
The anal sex is often not brought to completion; instead the man waits to cum inside the person's mouth during the oral sex part.
Also sometimes called a Texas Bird Feeder.
Not to be confused with a San Francisco Bird Feeder
Bruce loved bobbing away at an Omaha Bird Feeder, but his partner would have preferred it if he'd offer him a San Francisco Bird Feeder once in a while.
"I'm all sticky because my girl wouldn't finish our Omaha Bird Feeder just now."