When you're playing darts but your shots won't stick on the board.
I was at the bar last night but it didn't work out well, I had projectile dysfunction.
by Art.Vandelay September 23, 2012
A sudden loss in velocity of the projected particle, resulting in its failure to hit the target on the ground.
Joseph launched the rocket at an incorrect angle; as a result, it suffers from a projectile dysfunction.
by MathPlus July 21, 2016