#oof

What does "oof" mean?
OppOrFan, otis_our_frenchie, okul_oncesi_faaliyet, oneOfmyFavs, OneOfFavorite, outfitOnFleek, OutOfFocus, OvercameOurFears, OutfitOnFleek, OneOfFourteen, OneOfFour, OutOfField, OgOnFire, OneOfFive, OnlyOnFriday, out_of_focus, OceanOfFire, onOurFeet, Only_One_Flower, OneOfFew, OnlyOneFlawless, OscarOmarFM

明日はoff 2403 ｏｆｆ 765 off終了 212 off 3522088 oof-ersthewonderdog 337 oof- application 624 oof-fensive 249 oof-riends 323 oof-music 312 oof-okus 1619 oof-uri 1933 office 7487242 oof-td 42558 offroad 4241577 oof-tday 241 oof-ighting 318 oof-riend 285 oof-2016 130 oof- msk 1044 oof-datruth 284 oof-una 391 oof-ftt 408 oof-usion 135 oof-ing 136 oof-cybass 110 oof-spb 751 oof-msk 183 oof-b56 128 oof-akind 160 oof-ff 1535 oof-fttt 116 oof-ancy 109 oof-amily13 200