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Written abbreviation of "There ain't no such thing as a free lunch," meaning nothing is ever really given away for free, so be wary of hidden charges, motives, or agendas. Of course, once you're signed up to the free program, you have to pay for all sorts of extra services to make it even worth using. It's a TANSTAAFL situation if I've ever seen one.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
There ain’t no such thing as a free lunchand TANSTAAFL
sent. & comp. abb. Careful, nothing is really free of charge. Of course, you have to pay extra for the data file. There ain’t no such thing as a free lunch.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.