Got niggas on the block with the Glock that don't think
I said, "that's a nigga back up," they in a bucket lapped up

from YG (Ft. Jeezy & Rich Homie Quan) – My Nigga Lyrics on Rap Genius

Meaning

He has friends in his neighborhood that are carrying handguns. He is implying that they will shoot before thinking about the consequences. “Lapped up” means there are more people in a vehicle than seats so they have to sit on each others laps.

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