Originally posted by Gandolf
There's 2 definitions. One is the PowerJelq device which has already been mentioned. Also, in many of the original Penis Enlargement pay sites from circa 5 years ago they refered to jelqs with a PC flex immediately following every 5-10 strokes.
Most here are referencing the device, which in my humble opinion is a peice of shit. I do, however, recommend throwing in a kegel every few jelq strokes to stay really engorged with blood.