D
- daemon
- daemon book
- dahmum
- dancing frog
- dangling pointer
- dark-side hacker
- Datamation
- DAU
- Dave the Resurrector
- day mode
- dd
- DDT
- de-rezz
- dead
- dead beef attack
- dead code
- dead-tree version
- DEADBEEF
- deadlock
- deadly embrace
- death code
- Death Square
- Death Star
- Death, X of
- DEC
- DEC Wars
- decay
- deckle
- DED
- deep hack mode
- deep magic
- deep space
- defenestration
- defined as
- deflicted
- dehose
- Dejagoo
- deletia
- deliminator
- delint
- delta
- demented
- demigod
- demo
- demo mode
- demoeffect
- demogroup
- demon
- demon dialer
- demoparty
- demoscene
- dentro
- depeditate
- deprecated
- derf
- deserves to lose
- despew
- dickless workstation
- dictionary flame
- diddle
- die
- die horribly
- diff
- dike
- Dilbert
- ding
- dink
- dinosaur
- dinosaur pen
- dinosaurs mating
- dirtball
- dirty power
- disclaimer
- Discordianism
- disemvowel
- disk farm
- display hack
- dispress
- Dissociated Press
- distribution
- distro
- disusered
- DMZ
- do protocol
- doc
- documentation
- dodgy
- dogcow
- dogfood
- dogpile
- dogwash
- Don't do that then!
- dongle
- dongle-disk
- Doom, X of
- doorstop
- DoS attack
- dot file
- double bucky
- doubled sig
- down
- download
- DP
- DPer
- Dr. Fred Mbogo
- dragon
- Dragon Book
- drain
- dread high-bit disease
- dread questionmark disease
- DRECNET
- driver
- droid
- drone
- drool-proof paper
- drop on the floor
- drop-ins
- drop-outs
- drugged
- drum
- drunk mouse syndrome
- DSW
- dub dub dub
- Duff's device
- dumb terminal
- dumbass attack
- dumbed down
- dump
- dumpster diving
- dusty deck
- DWIM
- dynner