grenade n.— «The problem was the third leg of this female tripod: the grenade. Now, this is a term my roommates and I use to describe the friend of the hot girls who was not blessed with the same physique as her head-turning counterparts...
flash-bang n. an explosive device that emits noise and light but is not intended to cause damage. Editorial Note: Flash-bang grenade is the full, more common, form. (source: Double-Tongued Dictionary)