charity hooker 

A hooker who does her work for free.

"Mary is a charity hooker, always thinking of her clients. Isn't that the hooker you want on your side?"

charity hooker by brokendreamboi July 15, 2009

Charity Hooker 

Charity spokespeople who promote their charity on high-traffic sidewalks by cornering tourists and other innocent passers-by.

Charity Hooker: Hi ma'am, do you care about free trade?

Innocent walker: Um, yes. Well no - uh, I have to go...(walks away hurriedly)

Charity Hooker by ericinnes April 1, 2011