1. An untidy woman; a slattern. Sluts are good enough to make a sloven's porridge. (old Proverb)
2. A servant girl; a drudge. Our little girl Susan is a most admirable slut, and pleases us mightly, doing more service than both the others. (Pepys)
3. A female dog; a bitch.
Origin: OE. Slutte; cf. OD. Slodde a slut, Icel. Slottr a heavy, loglike fellow, slota to droop.