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4.
when a person has a lot of time to smoke weed.

Nick Calantoni first came up with the word in 2006 so it is a fairly new term.
Otto: I got 5 hours till my mom picks me up.

Nick: Oh, you got nigga time
by nick cal December 04, 2006
 
1.
The reason black people are usually late.
Guy : Yo how long untill you come?
Jamal: Like 15 minnutes
Guy : ok

(2 hours Later)
Guy: Yo where you at?
Jamal: Im on my way now
Guy: Daym you is on some nigga time

by T3K9 August 02, 2008
 
2.
When Franklin from GTA 5 uses his special driving abilities.
Use nigga time to avoid that cop car in front of you
by MaceHindu37 October 28, 2013
 
3.
Engaging in a specific activity that you and your friends do a lot (considering "nigga" can be used to refer to someone as a close friend or "homie"). Generally to be shouted or yelled as you are entering a vehicle that will be taking to that activity.

Say, going to the mall.
Though, not to be said around black people.
Joe: Let's go to the mall and chill guys!

Everyone else: YEAH! IT'S NIGGA TIME!
by Altanic August 02, 2011