(noun) origin - jamaican 1980s. singular and plural.
1. An expression of support or encouragement.
2. An expression of remembrance.

origin - "Up" is an english term used to mean elevation. Therefore the term "big up" literally means to elevate highly or to a superlative degree.
"I want to big up everyone who has shown me support over the years."
"Big up on that excellent performance"
by neochin June 17, 2004
a show of respect, also see props.
big up to Kobe on merkin that trick in court
by herbmanhustlin March 20, 2005
congradulate, form of praise to oneself or to another
by UNKNOWN October 17, 2003
Commonly used in the Caribbean especially The Bahamas, Big up means to impregnate or that a female is pregnant.
My girlfriend just tell me she ready to get big up

Bey yal hear homegirl round da corner big up!
by GenK August 1, 2011