Green’s Dictionary of Slang

1. (US Und., also schlamming) very violent assault, stopping short of murder.

1951		D. Dressler Parole Chief 117: Forty-one arrests were for assaults, schlammings (near deadly assaults), stabbings [etc.].
1965		J. Thompson Texas by the Tail (1994) 9: He’d had to sweat, in danger of losing the dough and getting a schlamming.

2. (US black) fighting, either with fists or knives.

1992		T. Williams Crackhouse 151: slamming fighting.
2002		‘Touré’ Portable Promised Land (ms.) 156: We Words (My Favorite Things) [...] Slammin. Blazin. Buggin.