Voluntourism

I first encountered this portmanteau in a satirical context (The Problem with Little White Girls (And Boys): Why I Stopped Being A Voluntourist)...so I was appalled when Google brought up mostly serious usage of the term. Urban Dictionary retains the satirical edge in its definition:

Voluntourism, an act carried out by "voluntourists", is when hoardes of - generally - the great unwashed backpacker brigade descend on a place to do have a jolly nice holiday - usually at precious little cost to themselves - and do the occasional bit of good work. 

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