D2D
n.— «“It’s missionary work turned into a business,” said Cameron Treu, 30, who served his mission in Chile and was recruited into D2D (that is door-to-door in sales lingo) by another former missionary.» —“Door to Door as Missionaries, Then as Salesmen” by Kirk Johnson in Oak Brook, Illinois New York Times June 11, 2009. (source: Double-Tongued Dictionary)