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
1 more definition
When a man cant find the means to ejaculate during sex
I'm Vety and I suck balls (and have projectile dysfunction)
by Prince2011 October 14, 2011