So I told her to back it up like burp, burp

from Lil Wayne (Ft. Static) – Lollipop Lyrics on Rap Genius

Burp Burp is the sound made by large vehicles (Trucks, Semi-trucks)to warn people around them that they are reversing.

Wayne’s reference to burp burp is him saying his girl has a large ass and is ‘backing it up’ toward him.

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