twin skin
n.— «Maybe, I reasoned, I could still wear a two-piece tri suit so long as I wore a singlet long enough to conceal what us twin mamas lovingly refer to as “twin skin.”» —“Racing Like a Rookie” by Kara Douglass Thom Xtri.com July 28, 2006. (source: Double-Tongued Dictionary)
Further reading
Jennifer, a tutor in Tallahassee, Florida, wonders what to call a segment of an orange. Among botanists, it’s a carpel. Informally, it’s a segment, slice, wedge, peg, or pig. It may be that these segments are called pigs, because all...
Stunt performers in movies have their own jargon for talking about their dangerous work. In New York City, the slang term brick means “cold,” and dumb brick means “really cold.” Plus: the East and Central African tradition...