gotcha

[goch-uh]
Pronunciation spelling. got you (usually used interjectionally).
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

gotcha
1932, colloquial pronunciation of "(I have) got you."
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

gotcha definition

jargon, programming
A misfeature of a system, especially a programming language or environment, that tends to breed bugs or mistakes because it both enticingly easy to invoke and completely unexpected and/or unreasonable in its outcome.
For example, a classic gotcha in C is the fact that
if (a=b) code;
is syntactically valid and sometimes even correct. It puts the value of "b" into "a" and then executes "code" if "a" is non-zero. What the programmer probably meant was
if (a==b) code;
which executes "code" if "a" and "b" are equal.
[Jargon File]
(1995-04-17)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
You've followed our advice, but somehow, they gotcha anyway.
He made a motion that he was going to touch gloves, but instead he unleashed a
  powerful left gotcha punch.
The gotcha there is that scientists still have a poor understanding of how the
  brain works fundamentally.
But politics, as practiced these days by politicians and polemical
  commentators, is one long trivial game of gotcha.
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