He who speakin' the least is Chief Keefin' the peace
Gambino puns on the phrase “keeping the peace” and references up-and-coming rapper Chief Keef
Also, “chiefing keef” refers to smoking a fine bowl of weed, so “chief keefin' the piece” will get someone super high to the point that they won’t be talking much.
It also references the fact that Chief Keef doesn’t like to speak that much which is heard in the Back & Forth video with Childish and Chief Keef.
“Peace” can also be interpreted as “piece”, slang for a fire arm and Chief Keef is known for rapping about fire arms and his most famous ad-lib is “Bang Bang” which also links to the proverb of those “speakin' the least” taking the most action.
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