Max on a Monday
Drinking excessively all day with the express purpose of drowning out the misery that cloys to every working day.
I would rather make threatening gestures toward walrus genitals than get between booze and Dave when he goes Max on a Monday.
Max out Monday
The act of going off program to potentially destroy your body with the excuse that its max out Monday by attempting; A max deadlift, max squat, max bench, or all of the above.
“Looks like Tom is doing another Max out Monday.”