TINSTAFL 

An acronym for "There is no such thing as a free lunch."

"When in doubt, just remember TINSTAFL!"

TINSTAFL by neops August 13, 2005

tinstaafl 

there is no such thing as a free lunch; for everything everywhere, someone somewhere had to work for it

When Bob tried to get away with cheating on his math test, his teacher said, "Tinstaafl," and gave him a score of zero.

tinstaafl by Jim Downard October 4, 2003

TINSTAAFL 

ACRONYM FOR: There's No Such Thing As A Free Lunch.

TINSTAAFL means get a job, you mooch!

TINSTAAFL by Muse4U August 1, 2006

tanstafl 

There Ain't No Such Thing as A Free Lunch.

Very old slang, dating back to before ain't became a legitimate English contraction.

I means that a prospect is too good to be true(TGTBT), in that you are being offered something for nothing.

Nate: Your eMail says Bill Gates will give you $250 for each person you send this to that sends it to someone else.

Uncle Dick: TANSTAFL.

tanstafl by Ronin Catholic January 3, 2008