This word can mean anything that you want.
Best used when memory loss has occured or when there are people around that wouldn't appreciate the word that it is intended to be.
"Look at the furtle durtle on that!"
In this case furtle durtle means VW beetle bonnet on a Lady in extremely tight pants in a crowded drinking establishment.
A shortened form of the "diaphragmatic startle" response where the diaphragm briefly contracts as the phrenic nerve is manipulated during surgeries such as thoracic outlet decompression.
The phrenic nerve descends along the surface of the anterior scalene muscle. To confirm its identity, gently manipulate it to elicit a dartle response.