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1.
That's how deep they put your cascet when you're dead. So that simply means to kill smb
U wanna beef wit me? I'ma put cha six feet deep
by yo-man July 18, 2006
 
2.
The proper depth for your ex wife.
Six feet deep is the proper depth for my ex wife.

'Six feet deep, nigga, that's the depth' Obie Trice
by Andy June 18, 2006
 
3.
To bruy or kill someone
Quit fucking with me or I'll make u six feet deep!
by mikeock April 12, 2005