Rude way of asking whether something was understood. The phrase essentially asks the target if they expect an absurd, disgusting favour just to satisfy their unrealistic or ungrateful desires.
А может тебе в рот нассать, чтобы морем пахло?:)
Do I have to pee in your mouth so that you get the smell of the sea?
(Злой Султан @ izhevsk.ru, 11/2000)
