A Rubber Pistol for Self Defense Training Against Black Tires

 https://i.redd.it/85kceqapgtz51.jpg

In this meme, we have a rubber pistol obviously meant for self defense training.

The full translation says "A rubber pistol for self-defense training made out of black rubber"

However, the joke is in the "za trening odbrane od crne gume"   

"for self defense training from black tires."

So he's shooting black tires.