look up any word, like dirty sanchez:
 
1.
In computer video game terminology the mouse-finger is the dominant, or preferred, finger the video game player uses to wield their most valuable implement of destruction, i.e. the computer mouse. Without one's mouse-finger one is completely helpless.
Joe: *Crack* Damn!
Mike: Hey Joe, why the expletive?
Joe: I just broke my mouse-finger. I won't be able to finish the Unreal Tournament.
Joe: Your passing will be remembered in our myths and legends for years to come. Rest in peace.
by Adam Wayne May 13, 2005
 
2.
using ones forefinger to point out things on a computer screen.
caleb was trying to show me something on the screen on youtube. he used his mousefinger to point it out to me.
by db208 January 15, 2011