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1.
Short for relative. Another word for a close friend.
What'cha got dealin for your birthday relli?
by Peril May 19, 2006
 
2.
a word most commonly used by people in blood gangs. meaning "my nigga, or bro"
Example 1
guy 1- aye you know Dre?
guy 2-yeah bro that's my Relli !

Example 2
guy 1-whats up bro
guy 2-whats good relli
by Criplovehoe November 17, 2013