If "doing a marcus" is used, it means that you arrive at a time that you chose rather than the agreed time.
A phrasing meaning to leave that person alone cause he or she does not want to be disturbed
person: hey wyd?
me: DO NOT DISTURB ME BITCH!! LEAVE ME ALONE!!!
A person who always sleeping on a 3 am mark
Pokeon: you okay dude?, you seems like you didn't sle-
Vonpier: 'sigh' I'm doing a prox for the past a week now
Pokeon: oh...I'm sorry
if some one has an important meeting ( e.g. with his/her boss), but doesn't show up, because he wasn't prepared)
Mr. Miller had to hand in his financereports, but he didn't have them finished jet, so he had to do the flex.
When you resign from your job but a worldwide pandemic derails your plans, so you beg for your old job back.
"I was going to take on a new job overseas but they had to go into harsh lockdown, so I ended up doing a Mig and stayed in Australia"
Leaving piss on the toilet seat instead of wiping it off after going to the bathroom.
I just went into the bathroom and the person before must have been doing a Julia! Gross!