A female lover; a mistress.
A woman of low morals; specif., a prostitute.
A woman prostitute.
A woman who is regarded as sexually promiscuous.
Origin of doxy
Perhaps from Middle Dutch *doketje, diminutive of docke (“a doll”). Cognate with Low German dokke (“doll”), Eastern Frisian dok, dokke (“a doll”), Swedish docka (“doll, puppet”).