M
M$
macdink
machoflops
Macintoy
Macintrash
macro
macro-
macrology
maggotbox
magic
magic cookie
magic number
magic smoke
mail storm
mailbomb
mailing list
main loop
mainframe
mainsleaze
malware
man page
management
mandelbug
manged
mangle
mangled name
mangler
manularity
marching ants
marbles
marginal
marginally
marketroid
Mars
martian
massage
math-out
Matrix
mav
maximum Maytag mode
McQuary limit
meatspace
meatware
meeces
meg
mega-
megapenny
MEGO
meltdown, network
meme
meme plague
memetics
memory farts
memory leak
memory smash
menuitis
mess-dos
meta
meta bit
metasyntactic variable
MFTL
mickey
mickey mouse program
micro-
MicroDroid
microfortnight
microLenat
microReid
microserf
Microsloth Windows
Microsoft
micros~1
middle-endian
middle-out implementation
milliLampson
minor detail
MIPS
misbug
misfeature
missile address
MiSTing
miswart
MMF
mobo
moby
mockingbird
mod
mode
mode bit
modulo
mojibake
molly-guard
Mongolian Hordes technique
monkey up
monkey, scratch
monstrosity
monty
Moof
Moore's Law
moria
MOTAS
MOTOS
MOTSS
mouse ahead
mouse belt
mouse droppings
mouse elbow
mouse pusher
mouso
MS-DOS
mu
MUD
muddie
mudhead
muggle
Multics
multitask
mumblage
mumble
munch
munching
munching squares
munchkin
mundane
mung
munge
Murphy's Law
music
mutter