Zolgar: Short answer:
no.
Still short but more to the point:
Not within the GOG Terms of Service, and it would not be in any way shape or form supported by GOG or your GOG account, and if you got caught doing so you would probably lose your GOG account and most likely have a monkey fly out of your rectum and force you to apologize to GOG.
Longer answer:
As with (almost) all Digital Distribution services, once you have purchased a game it is tethered to your account, permanently. You could, in theory, have GOG remove a game from your account if you really really wanted, but you could not in turn have them give it to another person's account.
However, as GOG is DRM free there is nothing physically stopping you from trading the installers of your games with someone else, on the honor system that you were going to uninstall it and never play it again, and so would they. However doing so directly violates the GOG Terms of Service, and would additionally be copyright violation and illegal in many countries (the distribution of copyrighted materials without the proper rights to distribute).
Besides, GOGs games are really cheap, and buying them supports an awesome company who is fighting the evils of the DRM monster.
Thanks for the illumination. I never knew that before, since i never read the ToS in every games i bought. Ain't Nobody Got Time for That.
Well i guess im not doing it, since i appreciate what gog.com fight against DRM Monsters and I enjoyed the games i mentioned before, some of them even brought tears to my eyes.