1)To have a large party or celebration.

2)Party hard.

3)"Let's party like it's 1999"="Let's celebrate."

Taken from December of 1999, when everyone was very excited about the new millenium coming up so they New Years Eve celebratins were extra loud and exciting.
Come on baby, let's grab some beer and party like it's 1999!

Mary said,"Let's party like it's 1999!" when she found out that her book won the Pulitzer Prize.
by Newbia May 30, 2004
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The day Schlatt ####### ###### all those people. He thought he could silence us, but were still here, we know.
Guy 1: Do you know what Jonathan Schlatt did on April 9, 1999?
Guy 2: he ####### ###### ### ##### ######## civilians
by hullám October 14, 2023
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A cray, amazing website containing all the new music you'll ever need.
"Yo, what's cray?"
"New music is cray. You'll party like it's 1999 at www.like1999.com."
by Jams1999 January 28, 2013
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The day the Dreamcast was released and killed by the PS2 hype.
Advertisement: 9.9.99
*September 9, 1999 comes...*
Guy: Dude, Sega just released the Dreamcast!
Other Guy: I'm not interested. I'm hyped for the PS2.
News: Sega becomes third party developer.
by CoolAkramTV October 22, 2018
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the shitiest car in the world that breaks down every time u start it
1999 toyota corolla is trash
by random fuker June 6, 2022
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