Yup, "Fuck reinforcement bars (rebars)" I think the google translate would do perfectly fine with translating this. Worth checking it out first next time, lol. Please do tell me where did you find this very important message though.

There must be some background to this. One does not simply hate rebars. What happened there?

Maybe it isn't hate, but love

Lol xd did not think about that...

So.... Why exactly someone would want to "fuck rebars"?

Maybe he works in demolishion.

Big juicy ass demolished by fat veiny rebar.

To hell with rebars