Beef and brocoli was first a term in the late 90s, early 2000 of weed mixed with pcp mint leaves, because the the mint leaves looked black mixed with the pcp plus the green of the weed...hence beef and broccoli
Person 1: Hey, so I’ve got some bad news…
Person 2: Nu-Uh. Hold the broccoli, bro.
Alternatively
Person 1: Yo! I’ve got piping hot tea!
Person 2: Hold the broccoli, bro. I’ve got a test in half an hour and I know whatever you want to tell me will just distract me.