Well, most slang words that have been used for a long period of time have been added to the dictionary, but then again, some other slang words have not. So, it really depends on the word.
But, for a straightforward answer i would say yes, just because some slang words are in the dictionary.
~Hope this helped
I would say this would classify as a downward comparison as the person is talking about Mark who has a poorer job situation than him and this could be used to bolster the speaker's ego or to knock poor Mark or could just be an observation.
Sir Walter scott is the Anwser
I am not sure maybe the narrative was in a different piece
