1 definition by JTTTTT
A heinous cousin of the upper decker (a classic bathroom prank), in which someone first defecates then procedes to place his or her fecal matter into a light fixture or other raised object in the target bathroom, leaving quite a surpise for whomever enters next.
To demonstrate her hatred for corporate America, Lauren left a slam dunk in the lamp in the Starbucks.
by JTTTTT March 24, 2010