That one friend who sort of acts as a barrier/shield between you and a dickwad whom you don't like and a fight/arguement could always ensue if your bufferpal leaves or isn't there.
Bro#1: Sup hommy! I didn't know you knew Tim?
Bro#2: Yeah he's actually my bufferpal

Bro#1: Oh I figured, man he's really cool.
by The Slicker December 30, 2019
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