Nineteen-ninety something and the party is jumping

from Kool A.D. – Hyphy Ballad Lyrics on Rap Genius

Meaning

Reference to a verse in their song “Commercial” where they do many lines in the style of:

It’s 1991/And the party is fun

etc.
http://www.youtube.com/watch?v=7DfPDvdLsac

To help improve the meaning of these lyrics, visit “Hyphy Ballad” by Kool A.D. Lyrics and leave a comment on the lyrics box