All your guns is borrowed

from The Notorious B.I.G. – What's Beef? Lyrics on Rap Genius

A lot of people cut down on costs in the ghetto by sharing a gun with their friends, since it’s rare that they will both need a gun at the same time (like a time share)

This may also be a veiled shot at Pac. 2Pac would borrow guns from Big when he would travel to New York. You can hear some of 2pac’s interviews talking about the police raiding his hotel room, him taking the case and telling the police nothing. That’s why Biggie also says “Your man passed the gat to me”, letting Pac know that his friends are traitors.

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