To waste large amounts of time at work by discussing completely mindless, non-work related matters with colleagues. Originally applied when the interruption was unwelcome, but now commonly used for all extended non-work related discussions in the office.
"Do you actually have anything work-related to discuss, or did you just come here to get your Shad on?"
"No, I just came here to get my Shad on."
Mighty risky.
From a Space Ghost episode called "OldKentucky Shark." The quotation is:
"A shark on whiskey is mighty risky, but a shark on beer is a beer engineer."
"Ooh, 45 in a 20? That's pretty shark on whiskey."