P.O.D.
packet over air
padded cell
page in
page out
pain in the net
paper-net
param
PARC
parent message
parity errors
Parkinson's Law of Data
parm
parse
Pascal
PascalCasing
pastie
patch
patch pumpkin
patch space
path
pathological
payware
PBD
PD
PDP-10
PDP-11
PDP-20
PEBKAC
peek
pencil and paper
Pentagram Pro
Pentium
peon
percent-S
perf
perfect programmer syndrome
Perl
person of no account
pessimal
pessimizing compiler
peta-
pffft
PFY
phage
phase
phase of the moon
phase-wrapping
PHB
phreaker
phreaking
pico-
pig-tail
pilot error
ping
Ping O' Death
ping storm
pink contract
pink wire
pipe
pistol
pixel sort
pizza box
plaid screen
plain-ASCII
Plan 9
plan file
platinum-iridium
playpen
playte
plokta
plonk
plug-and-pray
plugh
plumbing
PM
point release
point-and-drool interface
pointy hat
pointy-haired
poke
poll
polygon pusher
POM
ponytail
pop
poser
post
postcardware
Postel's Prescription
posting
postmaster
PostScript
pound on
power cycle
power hit
pr0n
precedence lossage
pred
prepend
prestidigitization
pretty pictures
prettyprint
pretzel key
priesthood
prime time
print
printing discussion
priority interrupt
profile
progasm
proggy
proglet
program
Programmer's Cheer
programming
programming fluid
propeller head
propeller key
proprietary
protocol
provocative maintenance
prowler
pseudo
pseudoprime
pseudosuit
psychedelicware
psyton
pubic directory
puff
pumpkin holder
pumpking
punched card
punt
Purple Book
purple wire
push
Python