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.» —“Always fly to concerts with a willing wing” by Patrick Troy in University of Florida, Gainesville Independent Florida Alligator May 24, 2007. (source: Double-Tongued Dictionary)
Further reading
Joe from Fort Lauderdale, Florida, asks about pony, the term he and his fellow maritime academy students used to mean “a practice test” or “a copy of a previous test” to help them crib for an exam. Among 19th-century British students, the slang term...
You know the expression fly in the ointment: It’s that glaring typo on an impressive resume or that first scratch on a brand-new car—the one little flaw that spoils it all. This phrase goes all the way back to the biblical Book of Ecclesiastes! And...