I've noticed this in looking up job advertisement buzzwords here and here and here.
Though to be fair, i first searched for 'job advertisement buzzword code”. A second search of 'Job advertisement red flags' seems to give you more inline results with what 'red flag' suggests, but from less prestigious websites seen here and here.
In searching “what job advertisement buzzwords really mean” i feel we got quite a bit clearer here but it still mostly rather vague and watered down like here.
One calls 'Fast paced': “Do you do well with last-minute work, unexpected fire drill assignments, unplanned late hours, and multiple deadlines? Use of this word in a job description can imply long hours. It may also indicate a company in flux, or prone to unexpected changes in direction.”
Which seems completely false to me. It typically means your going to be ground to the bone under work work work instead of other staff being hired because it's cheaper not to have the second expense of another 'human resource' on the books, or you're only running with enough staff, so you'll get shit for calling out, and 'others' will have to pick up your slack.