$xnick = $1;
$xident = $2;
$xhost = $3;
$xchannel = $4;
$xtext = $5;
# holy f*ck you line waster
# I’m calling the environment police, you’re killing ns

Source: Direct link to the source code
Software: Perl Underground
Programming language: Perl

/* #### f*ck me! who wrote this crap?
   think “abstraction”, baby. */
/* #### this horribly-written crap can mess with global
   state, which this function should not do. i’m not fixing
   it now. someone needs to go and rewrite that sh*t
   correctly. –ben */

Source: Direct link to the source code
Software: XEmacs
Programming language: C

/* Jeezus Christ! I have no idea why Microsoft’s file
* does NOT define the !!!STANDARD C!!! symbol PATH_MAX!
* F*cking nonstandard piece of sh*t. */

Source: Direct link to the source code
Software: httpxtran
Programming language: C

#ok, get ready for this new sh*t
#ready?
#
#
#
#
#
#
#
#
#i hope so
#
#
#
#y the f*ck am i coding when i aint got
#sleep!!!?!?!????!??!?!?

Source: Direct link to the source code
Software: sudoku
Programming language: Perl

/* This function has cost me 5 days of trying to find some
 * way to make gtk/pango/gdk do this. I’m only using
 * this way because 2 gtk/pango developers said this is the
 * only way at this time. So if you change it.. Your changes
 * better f*cking work :P
 */

Source: Direct link to the source code
Software: Guifications
Programming language: C