Hello,
Title edit appeals are now to be done via Wayfarer Help Chat. More information can be found here:
We do not know why your edit was rejected, but as you explained, the use of zajebistej can be slang for a s3xual act. I did search for its meaning on Google, and the first result that comes up is that it means effing awesome, kick butt (but instead of butt, it’s the word for it that starts with A in English). I would make sure to include some information about this when appealing, or suggest that they should search for the word meaning online and that they’ll find the results pointing to it being vulgar slang.