The term 'barrel bottom stuff' refers to the sediment that accumulates at the bottom of a barrel. The three crossword solutions for this term are LEES (4 letters), DREGS (5 letters) and DREG (4 letters). LEES are the sediment that accumulates at the bottom of a barrel of wine or other alcoholic beverage, while DREGS and DREG are similar terms used to refer to the sediment that accumulates at the bottom of any type of barrel.