mad wae it (MWI) - utterly drunk
magic - great
mair - more
maist - moist
maw - mum
mauchit / manky - very dirty
meltit / melted - to be on drugs
mense - giant / great
messages - shopping
mental - insane / wild
mibay / mibbe - maybe
min / mannie - mate
mince - nonsense
minger - dirty/smelly/ugly/horrible person
mokit - dirty
mon then - fight me
the morn - tomorrow
the morn's morn - tomorrow morning
motor - car
muckle - large
munter - ugly person