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1.
Acronym for: "There Ain't No Such Thing As A Free Lunch"

Accredited to author Robert A. Heinlein in his novel "The Moon is a Harsh Mistress"
TANSTAAFL is the golden rule.
by Depherios November 15, 2003
 
2.
There Ain't No Such Thing As A Free Lunch
by Flamin Homer May 31, 2003
 
3.
Abbreviation

A common shorthand for the colloquialism "There ain't no such things as a free lunch" implying that anything, as free as it may appear, has a real hidden cost.
(SMS)

Fred: WTF!? My stay was comped, but at checkout they charged me 4 the cable, phone, and internet!

Barney: TANSTAAFL
by Guesty Sueless May 31, 2010
 
4.
T.here A.in't N.o S.uch T.hing A.s A. F.ree L.unch
Something advertised as being "free" will invariably have hidden costs.
Kid: Woah, why does Facebook have a whole bunch of Ads on their site all of a sudden?
Teacher: TANSTAAFL
by JBLuverxo<3 November 17, 2011
 
5.
There's always new shoes to appreciate, adore, fondle, love
I broke up with my girlfriend and TANSTAAFL
by TANSTAAFL Man June 04, 2012