What is a whoopie sling?

It's a lightweight form of suspension related to hammock webbing (from tree to hammock end) which has to do with passing a piece of cord through itself and ultimately enabling some easy adjustments.

http://whoopieslings.com/

"which has to do with passing a piece of cord through another"

I thought it was passing a piece of cord through itself to make an adjustable hanging mechanism.

Hammock hanging apparatus. Thanks guys. There's no way I was Googling that from the office!

Doug is correct, A whoopie sling is formed with a single piece of hollow core braided rope–usually Amsteel or Dynaglide– to form an adjustable loop. The Hollow core rope acts as a constrictor on the piece fed through itself much like a Chinese finger trap. 6-12 inches of line pass back through it self doubled over forming a loop of varying size depending on how long of piece is used. The section that is buried can be pulled shorter or longer to adjust the size of loop on the end.

Hammock guys have only in the past 2 years cannibalized the whoopie sling from the aurborist industry, where they have been used for years to form adjustable attachment points high in trees.

Tough Jolly Green is not to far off as a similar piece of rope work is the UCR (Utility Constrictor Rope) that is made from 2 pieces of line and adjusts in a similar manor.

>It sounds like it would involve a willing partner and a safe word.

THAT is what I will always think of now when I hear whoopie sling.

Link to video tutorial here: