look up any word, like sex:

1 definition by Leesa Buhn

 
1.
the action of extending one's pointer, middle, and pinkie fingers. much like the middle finger; however gunknife is used more strongly towards a more hated audience. (In order to really get the point across one will poke their audience with the gunknife)
WOW I'm so mad I'm going to gunknife you. *pokes with pointer, middle, and pinkie fingers*
by Leesa Buhn April 13, 2008