Taboo.1980.1080p.bluray.x264-worldmkv

Given the context: You probably have a high-quality encode of a rare 1980 Japanese film with that exact name, and you’re noting it’s the “long feature” meaning (some versions released as ~95 min, but this might be ~120 min).

The “long feature” part likely refers to the fact that this is the or full-length version — possibly the original 120–125 minute Japanese theatrical cut (or an extended version), not a shortened edit.

It looks like you’ve listed a file naming convention for a of the film Taboo (1980), released by the group worldmkv .