B5
back door
backbone cabal
backbone site
backgammon
background
backreference
backronym
backspace and overstrike
backward combatability
BAD
Bad and Wrong
Bad Thing
bag on the side
bagbiter
bagbiting
baggy pantsing
balloonian variable
bamf
banana label
banana problem
bandwidth
bang
bang on
bang path
banner
banner ad
banner site
bar
bare metal
barf
barfmail
barfulation
barfulous
barn
barney
baroque
BASIC
batbelt
batch
bathtub curve
Batman factor
baud
baud barf
baz
bazaar
bboard
BBS
BCPL
beam
beanie key
beep
Befunge
beige toaster
bells and whistles
bells whistles and gongs
benchmark
Berkeley Quality Software
berklix
Berzerkeley
beta
BFI
bible
BiCapitalization
B1FF
BI
biff
Big Gray Wall
big iron
Big Red Switch
Big Room
big win
big-endian
bignum
bigot
binary four
bit
bit bang
bit bashing
bit bucket
bit decay
bit rot
bit twiddling
bit-paired keyboard
bitblt
BITNET
bits
bitty box
bixen
bixie
black art
black hat
black hole
black magic
Black Screen of Death
Black Thursday
blammo
blargh
blast
blat
bletch
bletcherous
blink
blinkenlights
blit
blitter
blivet
bloatware
BLOB
block
Bloggs Family
blow an EPROM
blow away
blow out
blow past
blow up
BLT
Blue Book
blue box
Blue Glue
blue goo
Blue Screen of Death
blue wire
blurgle
BNF
boa
board
boat anchor
bob
BOF
BOFH
bogo-sort
bogometer
BogoMIPS
bogon
bogon filter
bogon flux
bogosity
bogotify
bogue out
bogus
Bohr bug
boink
bomb
bondage-and-discipline language
bonk/oif
book titles
boot
Borg
borken
bot
bottom feeder
bottom-up implementation
bounce
bounce message
boustrophedon
box
boxed comments
boxen
boxology
bozotic
BQS
brain dump
brain fart
brain-damaged
brain-dead
braino
brainwidth
bread crumbs
break
break-even point
breath-of-life packet
breedle
Breidbart Index
bring X to its knees
brittle
broadcast storm
brochureware
broken
broken arrow
broken-ring network
BrokenWindows
broket
Brooks's Law
brown-paper-bag bug
browser
BRS
brute force
brute force and ignorance
BSD
BSOD
BUAF
BUAG
bubble sort
bucky bits
buffer chuck
buffer overflow
bug
bug-compatible
bug-for-bug compatible
bug-of-the-month club
buglix
bulletproof
bullschildt
bum
bump
burble
buried treasure
burn a CD
burn-in period
burst page
busy-wait
buzz
buzzword-compliant
BWQ
by hand
byte
byte sex
bytesexual
Bzzzt! Wrong.