A form of headbanging adapted for the sludge metal genre of music. It is a full body motion often performed with bent knees that involves an initial leaning-back followed by a vigorous lunging-forward motion in which the sludgebanger's head can come dangerously close to hitting the ground. Pro sludgebangers are known to be capable of bringing their foreheads to within 10 - 20 nanometers of the ground without contact.
Occurs when one's semen comes in contact with any sort of home made pastry, usually cake or pie. Usually happens to be served at any gathering of sorts. Sometimes done on purpose, sometimes not. (noun)
Joseph: Did you hear about what happened at Mitch's party last night??? It turns out his birthday cake was a SLUDGECAKE!