bat wing
n.pl.— «With so much celebrity flexing and flaunting going on, more women are turning to plastic surgeons to give them shapelier, more sinuous arms, Harper’s Bazaar reports. The “bat wing procedure” for tightening and defining the triceps has become increasingly popular.» —“‘Bat wing’ procedure becoming popular” Toronto Star (Can.) Oct. 25, 1993. (source: Double-Tongued Dictionary)