Online you’ve got your m7s, m8s and m9s, right? M7s are people you’ve seen around and quite like, not full m8s though. M8s are your mates, obviously. M9s are your bezzas, your lifers, your day1s. Tru mates.
Then of course you’ve got your m1 - your best mate. You’ve got your m0; your worst mate.
Also you’ve got m69s (m8s you’ve 69’d), m249 (a light machine gun) and M80 ( a motorway in Scotland)…