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M

M/F? - Male or Female?
M8 - Mate
MEGO - My Eyes Glaze Over
MEH - The verbal equivalent of a shrug of the shoulders
MHBFY - My Heart Bleeds For You
MHOTY - My Hat's Off To You
MM - Mama Mia!
MMD - Make My Day
MO - My Opinion
MorF - Male or Female
MOTAS - Member Of The Appropriate Sex
MOTD - Message Of The Day
MOTOS - Member Of The Opposite Sex
MOTSS - Member Of The Same Sex
M$ - A well-known software company
MSG - Message
MTBF - Mean Time Between Failures
MTF - More To Follow
MYOB - Mind Your Own Business
MYW - Makes You Wonder