ECR - El Camino Real
Ellie - Law Enforcement
English - Spanking, etc.
Enhancements - Breast implants
Envelope - Often cash payments for a provider are placed in an envelope. Rather than handing her cash directly, or discussing money, the envelope is left in a conspicuous location for the provider to pick up as she leaves (outcall), or after the hobbyist leaves (incall).
Escort - A woman who is paid for her time and companionship.
Expats - Persons living in countries other than their own citizenship. Generally refers to Americans, Canadians or Europeans living in other countries.