Playing Mustard

Involves working your ass off for a few days prior to taking time off work, as opposed to playing catch-up (ketchup) upon your return to the office afterwards.

"Hey Bryan, you wanna duck out early today and play a quick 18 with Frank and Toby down at the country club?"
"I wish man. I’ll be in the office playing mustard for the next 3 days before Krista and I head to Bermuda for our 10-year anniversary next week."