A particularly tall, thin woman or girl. I know it's crazy, but anytime he goes out on his own or with his friends, I have this irrational anxiety that some long-tall-Sally is going to catch his eye and steal him away from me. I was always a long-tall-Sally as a kid, which I think intimidated some of the boys in my class.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. a tall girl or woman. Isn’t she a gorgeous long-tall-Sally?
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.