Best find a terminal that has a lot of XP awards (Adam Jensen's laptop in Sarif Industries is a good candidate, as revealed by the dude in the video).

Basically:

Save the game before attempting to hack a terminal or device.
You will be reloading the save file made in step 1 after each successful hacking attempt.
Successfully hack the device (preferably the security node, so you unlock all the data stores).
Use as many Nuke Viruses and Stop Worms as you need, since you will be reloading the game.
Once the device hacking is successful, you will be presented with the hacking results screen, and the prompt to continue.
Do not press the button to continue.
Load the save game made in step 1 instead.

Repeat steps 3 to 7. You will notice the totals on the hacking results screen increase and accrue from your previous attempts.

When you are ready to barf twice, accept the hacking results and the 'Updates' notifications will show the results of all your prior attempts.
Note: The data packets earned from hacking and reloading are are still issued if you complete a on different terminal. So, if you milk Jensen's terminal, you can walk accross the hall and still get it all.