The Brief: "Vacky" is a humorous nickname for "vaccine."

DEEP DIVE
“Vacky” or “vakky” is the latest pandemic-related term to come from Black Twitter. Shorthand for vaccine, vacky is a colloquial way to refer to the COVID-19 vaccine.
Yβall boys calling the vaccine the VACKY is pure comedy.
— the pen (@champwroteit) December 16, 2020
I want a stimmy. I want a vakky. pic.twitter.com/tKCJOxSTzL
— Dr. Anthony Meowci (@sendcats) December 16, 2020
they rolling in the vacky like itβs the Larry Oβbrien trophy ππππππππ https://t.co/QNn1Mezz0R
— bread, ribs, $100 bills (@no_cut_card) December 14, 2020