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2.
Used widely throughout the Australian medical student and broader community to express a desire to get involved with or get crazy at an event, particularly Convention. Widely abbreviated to GAI. Can be used in a larger sentence or as a stand alone phrase with the intent of g-ing up an audience.
Let's get amongst it Harbourside
by Convention Mole January 25, 2011
 
1.
To go to a place i.e a club or pub and mingle with women or men,with the intension of pulling one of them.Or mearly to go into a place an hav a really good time.
Lets go to Yate's and get amongst it
Lets go over to them fit birds an get amongst it
by Darran Green October 06, 2007
 
3.
A command to participate unreservedly; to make use of something without restraint. Go for it!

Also, 'Get Amongst It' is a very cool song by a vegan band called Vegan Band.
A: Can I try some of your soup?
B: Yea bro, get amongst it!
by Tomoithy May 22, 2008