It indicates the completion of a post-graduate degree in Business Administration, reflecting the speaker's educational attainment and specialization in that field of study.
It metaphorically contrasts individuals who actively seek knowledge and benefit from it (drinking from the fountain of knowledge) with those who superficially engage with information or lack a deep understanding (gargling).
It implies that the speaker pursued their studies and completed their graduation in Delhi, and subsequently relocated to Mumbai after finishing their degree.
It highlights the perceived importance of having a college degree in the contemporary global economy, suggesting that without a degree, individuals may face significant challenges in competing for opportunities and success.