The Game's verbal attack on Meek Mill last night seemingly came from nowhere.

But there may be a backstory as to why Game told a club audience he was going to beat Meek up for being a snitch, and then dropped the diss track '92 Bars' on him.

According to TMZ -- who spoke to sources close to both rappers -- Meek and Game were both present in June when Sean Kingston was hit with a bottle and got his 300K chain snatched at the Penthouse Nightclub & Dayclub in LA.

Game believes  Meek told Kingston that Game or someone in his crew was responsible for the attack and robbery -- which is why Game called Meek a "snitch."

Police tell TMZ that police never believed Game was a suspect, and have closed the case because Kingston isn't cooperating.

Here's what Game said about Meek in '92 Bars:'

She got a couple mill and she don't even know Meek And ever since that nigga snitched on me we just don't speak See that shit you got with Drake is like a slow leak Blood'll be dripping like Niagara if I poke Meek Nicki won't get no sleep, I'm coming through at 4 a.m Four deep, to leave his dead body on the soaked sheets It could happen lowkey You better have Ross call me or you gon' be eye level with a roach feet This ain't a diss, nigga This is all lives matter except this nigga's