look up any word, like donkey punch:
 
1.
A load of semen that a man shoots.
My erectile projectile just landed on my cat walking past :(
by weluvb0g February 03, 2004
 
2.
A penis which is full of semen, waiting to explode.
-removes my boxers and my member is a erectile projectile ready to be used-
by Omg_an_erectile_projectile October 23, 2010