stelzer
stel•zer•ed, stel•zer•ing, stel•zer

To take that which was funny and cause it to cease in its funniness. To kill, maim, or otherwise incapacitate a joke. Used in a derogatory and/or jovial manner.
a) Oh man, you just totally stelzered that joke. 
b) It is incredible how unfunny you are, you stelzer every last conversation.
c) You have stelzered my jokes for the last time, now I shall shoot you.