To get down means to participate in something with other people. It could be anything, really, but it generally is associated with smoking some ganja.
Yo, you wanna get down on this blunt?
by 234234234999 January 22, 2008
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To exit a car. This expression is common to small towns in south Louisiana such as Cottonport and Donaldsonville.
"I'm going into the store to get some groceries, you want to get down or stay in the car."

"They drove up to the party and didn't even get down. They just sat in the car all night."
by Dub Moss March 25, 2008
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to use opiates (heroin, hydrocodone, oxycodone, hydromorphone, morphine, codeine, fentanyl, or the like)
Dude, I just got 5 OC 80's! I'm bout to get down with the get down.
by Weezie Wizzle September 12, 2006
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An Internet meme that started in Japan, featuring people dancing extremely fast with odd positions, paired with Hirose Kohmi's song Promise. It started when a user of Nico Nico Douga, a Japanese video sharing website like YouTube, posted a video of a glitch in the Nintendo 64 game 007 Goldeneye, where, if the game ROM was partially removed from the console (if the cartridge wasn't fully in) the characters, at seemingly random moments, would spaz out, their models moving to random poses every frame. Another Nico Nico Douga user then put the song Promise to the glitch video, with the phrase "Get Down!" playing first, as the characters started glitching, giving the appearance of random dancing. Someone else then created an anime-style animation of a character called Nitori dancing to the song, showing her spinning in midair to mimic the glitch. Users started taking dozens of pictures of themselves in random poses, put together to form an animation, similar to stop-motion. It's still spreading as of early May 2010, with dozens of such videos on YouTube.
Get down yureru mawaru fureru
Setsunai kimochi futari de issho ni nemuru
Winter land anata dake mitsumete
Watashi dake mitsumete ashita wo chikau
Gyutto dakare moeru koigokoro
Hageshiku maichiru yuki ni tsutsumarete
Eien ni ai shiteru kyou yori ai shiteru
Zutto eternal love!

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English translation:

Get down
A shaking, spinning, touching, painful feeling
Sleeping together in a winter land
You looking only at me, me looking only at you
We make a promise for tomorrow

You hold me tight and I feel a burning love
Wrapped in the heavily falling snow
I’ll love you forever, I’ll love you even more than today
Forever, eternal love
by 73H1337N008 May 4, 2010
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the act of figthing
Yea I got down with those niggas and fucked 'em up.

Ey foo, you wanna get down?
by tyron December 10, 2003
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Usually meaning going or getting into a fight
Eh the homie is getting down with that bitch.
by Dagg3r55 January 4, 2008
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