is not used in modern standard Japanese. If this were explanatory-/, it requires a dictionary form of before it. / exists in some Eastern/Nothern dialects, but it sounds fairly provincial.
In fact, this is one of so-called ), an Internet meme based on a certain gay porn video series. Semantically it just means something like "That's for sure." Some words originating from this video series are quite popular among net users, and many people are using them even without knowing their origin.
Anyway, is broken as a proper Japanese expression. Use it only when you know what you are doing.
**EDIT:** As @goldbrick pointed out, there are cases where , , , and such can directly attach to , , , etc. They sound rough but not particularly dialectal. can be a sound change of both and , depending on the context. Nevertheless, sounds rare to me, presumably because it's a mixture of rough and mild expressions.