gnat's
nounEtymology Shortened from various (often vulgar) phrases for parts of the anatomy of a gnat, a very tiny insect. These include gnat's arse/gnat's ass, gnat's chuff, gnat's prick, and gnat's whisker.
1
Slang A very tiny thing or distance; a whit; a jot; something of no consequence.
- The building project will be a gnat's away from being finished.2013, Catherine Robertson, The Misplaced Affections of Charlotte Fforbes: