This applies only to the gut or intestine, not to offal (edible internal organs such as liver or kidneys) in general, and it applies only to a certain stage in the cleaning process. Intestines are used largely for "casings" (sausage skins).

"The processing of animal intestines includes the following principal operations: separation of the intestinal complex into parts, removal of the intestinal contents and thorough washing of the intestines, fat extraction (skimming), and removal of the mucous membrane (stripping) and other superfluous layers."
https://encyclopedia2.thefreedictionary.com/Processing of An...

So which part of this process is "desarrado"? Lorena has cited a source (I'm not sure which country it comes from) which says that it's the removal of the mucous membrane:

"Desarrado: Máquina electrica con dos rodillos concentricos que remueve el “sarro” interno de la tripa (mucosa intestinal)"
https://es.slideshare.net/Cgonzalez6/tema-2-industria-frigor... (slide 22).

The following source from Argentina seems to agree, but indicates that the mucous removal stage also includes removal of food residues (known as "manure stripping"), done after the intestines are turned:

"Se procede luego al desgrasado de esta tripa; para ello se utiliza una máquina: un operario se encarga de que las tripas se pasen por una desebadora mecánica (máquina extractora de sebo), para quitarle adiposidad. […] A continuación los lavadores de tripas las lavan […]. Revierten la tripa dejando expuesta la superficie interna al exterior. Otro obrero las hace pasar por una segunda máquina de cilindros-cepillos (de cerda), que tiene por objeto hacer una limpieza perfecta33.”
Note 33 reads: “En años posteriores a esta máquina se la va a llamar 'desarradora'; limpia el sarro -impurezas y restos de alimento- adherido a la cara interna de las tripas, operación denominada 'romper el sarro'.”
http://www.pimsa.secyt.gov.ar/publicaciones/DT 52.pdf (p. 14)

"Intestinal cleaning
Stripping, degreasing and mucus removal machine
This machine is suitable for stripping, degreasing and removing the mucus from the small and large intestines of cows."
https://www.itec.de/index.php/intestinal-cleaning.html

The previous source is German. Mucus is commonly called "slime", and removing it is called "de-sliming":

"“Slime” is the internal layer of the intestine, basically the internal (“mucose”) membrane"
http://www.fao.org/docrep/010/ai407e/AI407E20.htm

"The SSD/3B range of Beef Gut cleaning systems comprising of two Automatic Feed Stripper De-fatting machines, one Tongue fed Stripper de-sliming Stainless Steel support soak/tank along with turning tank/chute with receiving tray and finished casing tank."
http://stainlesssteeldesignsltd.co.uk/equipment/high-duty-fr...

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Note added at 3 hrs (2018-09-16 22:55:30 GMT)
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I put "intestine" in parentheses in the answer box because these machines are normally just called "strippers" and/or "de-slimers" (or stripping / de-sliming machines); the context will normally show that they are for intestines, so you won't usually need to specify that.