haha im a newbie when it comes to coding and finding the right lines but ill have a look arround to see if i can fix something up. i know xscreensaver can be turned on by the following command in terminal:
-activate Tell xscreensaver to turn on immediately (that is, blank the screen, as if the user had been idle for long enough.) The screensaver will deactivate as soon as there is any user activity, as usual.
It is useful to run this from a menu; you may wish to run it as
sleep 5 ; xscreensaver-command -activate
to be sure that you have time to take your hand off the mouse before the screensaver comes on. (Because if you jiggle the mouse, xscreensaver will notice, and deactivate.)
so i think it should be possible to link a hotword to that line to execute it