lats

noun[usually plural]2

1. •
   (slang) The latissimus dorsi muscles.
2. •
   (UK, slang) Latrines: rudimentary or military facilities for urination and defecation.

   • At Salisbury Plain and Camberley in 1909/10 I learnt a number of camping expressions like... lats (latrines). — 1927

noun2

1. •
   Initialism of Long-acting thyroid stimulator.
2. •
   Initialism of Landfill Allowance Trading Scheme.