Here are some possible contexts where you might hear "aur chale":
* After finishing a task: "Humne yeh kaam khatam kar liya, aur chale." (We finished this work, and let's go.)
* When starting a new activity: "Ab yeh kaam ho gaya, aur chale chai peene." (Now this work is done, let's go have tea.)
* Continuing a journey: "Yehi raasta sahi hai, aur chale." (This is the right road, let's keep going.)
The phrase is commonly used to show enthusiasm and a desire to move forward.