Is it the chicken ad? If so, there was a user with a bunch of nextbot addons that had this on all their Workshop uploads a while ago. Forgot who it was, though.
#Burgerking noise
woven bay
surreal shale
it's from an obunga nextbot with 3 eyes
vapid elbow
Why do people always ask this stuff here? It clogs up the discussions thing.
Check what addons you recently downloaded
And for god's sake please look at comments and ratings and subs before you download addons.
midnight wraith
I had downloaded it a while ago, and hadn't played gmod in a hot minute, it was the obunga, mb for clogging it up