- O
- OAO
- OASIS
- OATUS
- OAUS
- OB
- OBE
- OBF
- OBI
- object value
- object-oriented programming (OOP)
- OBNR
- OBO
- OBS
- obsolete
- OBTW
- OBX
- OC
- OCD
- OCR
- OD
- ODBC
- ODTAA
- OEM
- OF
- OFAP
- ofc
- off the chain
- off-deck
- off-the-shelf
- office drone
- official site
- offline
- offline browser
- offline buying
- offshored
- offsite storage
- OFX
- OG
- ogooglebar
- OH
- OHF
- ohnosecond
- OIC
- OICU812
- OIRWIS
- OIT
- OK
- OL
- OLAP
- OLE
- OLED
- OLGA
- OLL
- OLLI
- OLN
- OLO
- OLTP
- OM
- OMB
- OMDB
- OME
- OMFG
- OMG
- OMIK
- OML
- OMMA
- omnicide
- OMW
- OMWT
- on fleek
- on ice
- on task
- on the team
- on velvet
- on-demand
- on-screen
- on-the-fly
- onboarding
- one-click shopping
- one-stop shop
- ONID
- onion routing
- online
- online ad
- online auction
- online banking
- online buying
- online community
- online crime
- online dating
- online education
- online gambling
- online hate speech
- online jargon
- online job searching
- online marketing
- online newsletter
- online porn
- online profiling
- online review
- online shopping
- online survey
- ONNA
- ONNTA
- ontology
- ONUD
- OO
- OOAK
- OOC
- OOF
- OOI
- OOMF
- OOO
- OOS
- OOT
- OOTB
- OOTC
- OOTD
- OOTT
- OOYF
- OP
- open
- open access
- open garden
- open network
- open social
- open source
- open the drapes
- open your kimono
- open-collar workers
- Opera
- operating system
- OPS
- opt-in
- opt-out
- optical network
- optimize
- optoelectronic
- orbiting
- Ordinal
- org or .org
- organ donor
- organic search results
- organized coincidence
- orphan annie
- orphans
- OS
- OS X
- OS/2
- OSF
- OSI
- OSIF
- OSINTOT
- OSP
- OST
- ostrich years
- OT
- otaku
- OTASOIC
- OTB
- OTC
- OTF
- OTH
- OTIS
- OTL
- OTOH
- OTP
- OTS
- OTT
- OTTOMH
- OTW
- OUSU
- out-of-pocket
- out-of-the-box
- out-of-the-garage
- outage
- outbound link
- outrage porn
- outsource
- outstream video
- ova
- over-Mac'd
- overconnectedness
- overshare
- OWL
- owls
- OWTTE
- oy vey
- OZ
- O_O
