Amish lobotomy

When a person fellates their partner in a horse and buggy, especially when “brain” is involved. See: brain

Ethel gave me an Amish lobotomy on our way to the Lancaster county wicker festival.

Amish lobotomy

When you receive a blow job specifically including “brain” in a horse drawn buggy or carriage

Helga gave me an Amish lobotomy on our way to the Lancaster county pig competition.