Butterfly position 

A sex position in which the woman lies down on a flat object, like a bed or a table, and her legs are on the man's shoulders, and the man's dick is in her asshole.

Man 1: I broke up with Sherry yesterday.
Man 2: Good. because last night I took her home and she begged me to go butterfly position with her.
Man 1: Fuck you.

(A large fight then ensues.)

Butterfly position by The cock man January 7, 2009

Butterfly Position 

When a woman sits back on her heels with knees spread apart on the floor. Especially when she has a dress or skirt on which flies out in front of her.

One example, but not a good one is Taylor Swift's debut album cover. A better example is Donna Summer's album cover, I Feel love. In Taylor Swift's pose her knees are not as far apart as is usually defined as the butterfly position. Donna Summer poses with knees wide apart but is not sitting on her heels. Both are still variations of the butterfly position.

Butterfly Position by Paul? could be. June 5, 2019