Top Definition
A term used to describe someone who you have previously hooked up with, or laid, but who no longer holds any sort of significance to you.
Friend: What happened to that girl you've been seeing?
You: Lucy? Oh, she's such a yesterlay.
by Squidsquid March 20, 2013

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.