:Lariat redirects here. For the wrestling move, see lariat. For the genetic structure, see Splicing (genetics). Reata redirects here. For the comic book character, see Reata (comics) A lasso is a loop of rope that's designed to be thrown around a target and tighten when pulled. It is a well-known tool of the American cowboy. The word is also a verb; to lasso is to successfully throw the loop of rope around something. When referring to the entire length of rope used, before or after a loop is for… (More on Lasso)