Unpause application in Mac OS X

Find your paused app's process ID (using either Activity Monitor or ps -ax | grep ), then issue it the CONT signal using "kill" in the terminal (don't worry, "kill" is misnamed, it just sends a signal to an app - it's called kill because the default signal is QUIT)

% ps -ax | grep Safari
  461 ??        61:22.30 /Applications/Safari.app/Contents/MacOS/Safari -psn_0_180268
% kill -CONT 461
% 

To un-pause all applications, run this command in Terminal:

pkill -CONT -u $UID

or (as suggested here):

kill -CONT -1

To un-pause the specific app (such as Chrome), try:

kill -CONT $(pgrep Chrome)

Consider adding the following alias into your rc files (such as ~/.bashrc):

alias unpause="pkill -CONT -u $UID"

So next time you may just run: unpause.