“EX” in the Bob and Bosip FNF mod usually means Extra/Extreme difficulty — basically a harder version of the songs with remixes, tougher charts, and sometimes new designs or content. In fan discussions and showcase videos, the EX update is described as a special hard-mode expansion, and the EX songs are noted as non-canon to the rest of the mod.

What it means

  • EX = extra hard version of the song or week.
  • It often comes with new remixes, charts, and visuals.
  • In this mod, EX songs are treated as a special challenge mode rather than the main story path.

In practice

If you see “Tutorial EX” or “Split EX,” that usually means:

  • the same song idea,
  • but rebuilt to be harder,
  • with different patterns and sometimes new presentation.

Simple takeaway

So, in Bob and Bosip, EX is the mod’s harder, remix-style version of the content — not a separate character name or a hidden lore term.

TL;DR: EX means a tougher “extra/extreme” difficulty version of the mod’s songs.