What is Gunning?
1.
It means to insult someone repeatedly (verbally-usually using things about them, yo mama jokes, etc)
Damn Joey, you was straight gunnin on his ass
2.
To masterbate. Or beat your meat. Perferably to a porn dvd or magazine. Prisoners are pro's to Gunning
That niga in there gunning that hoe down.
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3.
Mercilessly revving an internal combustion engine beyond it's sensible limits. (Australian)
No wonder the block disintegrated, he was in second to get past that truck, and then somehow dropped it in reverse, and he was GUNNING the shit out of it at the time.
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4.
Usuallly pronouced as
"Man, Charles walk up to Doo with a knife and that nigga started gunnin'!"