“Walla” in Hindi has many meanings, but in this case it refers to the occupation or what one does. So a lime soda walla makes lime soda, a taxi walla would drive a taxi, the garbage walla picks up your trash, etc. Lime soda wallas are as common as chai wallas (aka tea sellers) as you walk around Delhi. This man was set up at a wholesale flower market on the outskirts of Delhi early one morning. You can always recognize them from the piles of lemons on his cart.