#otf

What does "otf" mean?
OnTheFly, oliver_thee_frenchiee, OnTimeFilms, OttawaTulipsFestival, OneToFollow, OfficialTeamFlat, OnTheField, OakTownFlexin, on_the_floor, OttawaTulipFestival2016, OldTownFlyers, OnlyTheFamily, OnTheFarm, onTheFloor, OnTheFlux, OnTheFloor, OnTheFlow, OneTrueFriend, OurTwoFaves, OnlyTheFinest, OrangeTheoryFitness, OnToFamily, on_the_fry, OnlyTupacFans, OffToFrance, OnTheFoot, ouTJazzFestival, OverTheFridge, OlhoTaFechando, OutlawTenFive

otf-❤️ 1006 otf-c 2035 otf-d 4261 otf-p 1548 otf-la 4258 otf-it 4360 otf-nation 17949 otf-amily 6036 otf-estivali 8736 otf-💯 3746 otf-am 1758 otf-ord 3075 otf-💉 2561 otf-sharesoscar 3872 otf-sojo 1782 otf- find facts 4158 otf-family 3680 otf-dance 2429 otf-knives 2077 otf-weho 894 otf-3 158 otf- 119 otf-estivali2016 1563 otf- king spartan 1818 otf-htx 577 otf-900gang 603 otf-est 546 otf-rs s 523 otf-marathon 616 otf-sco 497 øtf 962 otf-andom 563 otf-followtrain 712 otf-meridian 637 otf-mob 356 otf-900brasi 558 otf-oscarshares 346