SEBS
An acronym for Sudden Extreme Boner Syndrome. SEBS may occur due to a sudden high volume of stimulation, or occasionally no apparent reason at all. Unfortunate recipients of SEBS often experience pain, rupturing of clothing in the crotch, among other unpleasantries.
Stacy was going down on Chad, when Chad suddenly thought about Stacy’s mom and immediately contracted SEBS. His powerful erection broke the sound barrier and punched a hole in Stacy’s skull. Stacy’s mom heard the sonic boom from downstairs and immediately knew that SEBS had just lobotomized her daughter.