Next day's function, high class luncheon
Food is served and you're stone-cold munchin'

from Young MC – Bust a Move Lyrics on Rap Genius

Meaning

Stress eating. The fella seems older than expected here, maybe middle age? He’s attending a “function,” which is usually something work related. Its high-class status suggests well-to-do people, and it’s a “luncheon,” which is a “formal mid-day meal as part of a meeting.” Yet in the next line people start to dance.

However, in the video it seems to be a high school lunchroom (or college), so maybe “high class” means higher level classes aka college.

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