Possibly a shortened form of "to bar none" or "barring none".
bar none (not comparable)
- (idiomatic) Without exception; excluding nothing else of the same kind.
1913, Zane Grey, chapter 4, in Desert Gold:
- Mexican horses are the finest in the world, bar none.
1922, James Joyce, chapter 16, in Ulysses:
- . . . Ireland, or something of that sort, which he described in his lengthy dissertation as the richest country bar none on the face of God's earth.
- Follows a superlative-modified noun.
- French: please add this translation if you can
- Russian: please add this translation if you can
- Spanish: sin excepción (es)