Passing reminder of internet phenomenon on broken monitor (7,4)

I believe the answer is:
memento mori
'passing reminder' is the definition.
'memento mori' can be an answer for 'reminder' (memento mori is a kind of reminder). I am unsure of the 'passing' bit.
'internet phenomenon on broken monitor' is the wordplay.
'internet' becomes 'e' (I've seen this in other clues).
'phenomenon' becomes 'mme' (I can't explain this - if you can you should believe this answer much more).
'on' is an insertion indicator (as in clothing 'on' a person).
'broken' is an anagram indicator.
'e' placed into 'mme' is 'meme'.
'monitor' anagrammed gives 'ntomori'.
'meme'+'ntomori'='MEMENTO MORI'
'of' is the link.
Can you help me to learn more?
(Other definitions for memento mori that I've seen before include "Reminder of expiry" , "Reminder that death is inevitable (Latin)" , "Reminder of death (eg, skull) (Lat.)" , "A reminder of death's inevitability" , "skull perhaps" .)
