Things went sideways at a pool party 21 Savage attended yesterday in Atlanta.

A large group of people allegedly crashed the "Big Ass Pool Party" through the back, making 21 and his boys uneasy.

Things came to a head when one of the crashers hollered at a girl in Savage's group. Words were exchanged and guns were pulled -- including one by Savage, who looks like he got the piece from his friend.

The scene was captured in video sold to TMZ.

A handgun flashed at a pool party is a far cry from the sentiments Savage expressed in this Tweet last week. 

I wish everybody come together and kill all this beef They want us to kill each other especially now since we young and rich

— Saint Laurent Don (@21savage) June 4, 2018