It depends on your level of connection to current work. If you're genuinely doing something similar to something you've seen in some journal articles you've read, you can contact the authors of those journal articles and try to convince them to talk with you - probably via claiming some sort of reasonable result and asking politely.

On the other hand, you can always just ask about it in various places. Even if people think your idea is sure to be wrong they can still provide useful feedback. I'd be happy to hear you out, though if your "weird theory" isn't about condensed matter physics I'll be of limited expertise.