The correct spelling of the phrase "most vegetating" is /moʊst ˈvɛdʒəteɪtɪŋ/. The word "most" is spelled with an "o" and "s" while "vegetating" is spelled with a "g" instead of a "j." The "-ing" ending is pronounced as /-ɪŋ/ and there is no "n" after the "g." "Vegetating" means "growing as a plant," and "most vegetating" would mean "growing the most like a plant," likely used to describe someone who spends a lot of time laying around doing nothing.