Denshi Jisho — Online Japanese dictionary

オケピ orchestra pit
Noun, Abbreviation 
オケラ mole cricket (esp. the Oriental mole cricket, Gryllotalpa orientalis)
Noun, Usually written using kana alone 
オケる to go to a karaoke bar
Godan verb with ru ending, Slang 
オシロ oscilloscope
Noun, Abbreviation 
おじや rice gruel containing vegetables, fish, etc., and seasoned with miso or soy sauce
Noun 
おじん old man; old-timer; old fogey
Noun 
オセロ Othello (board game)
Noun 
おそろ same; matching; going together
Noun, No-adjective, Abbreviation, Slang 
おぞい 1: (Colloquialism) crude; inferior grade; worn; ragged; shameful;
2: sly; clever;
3: disgusting; repulsive; absurd
Adjective 
オッグ ogg (file container format)
Noun, Computer terminology 
オッズ chances of winning (a bet); odds
Noun 
おっと uh-oh; oops; sorry
Interjection 
おつむ 1: (Abbreviation) face (used mostly with children); head;
2: brains; intelligence
Noun 
オトト fish
Noun, Usually written using kana alone, Children''s langauge 
オナニ onanism (ger: Onanie); masturbation
Noun, Rude or X-rated term, Colloquialism 
オナホ sex sleeve (wasei: onanism hole); masturbation device that mimics female genitalia
Noun 
オナる to masturbate
Godan verb with ru ending, Colloquialism 
オナー honor; honour
Noun 
オネジ male screw
Noun 
おばこ virgin
Noun, Colloquialism 
オバむ (various meanings, including) to chant, "Yes we can, yes we can!"
Godan verb with mu ending, Slang 
オフミ offline meeting
Noun, Computer terminology, Abbreviation 
オプス opus
Noun, lat:, eng: 
おめこ 1:
2: (Rude or X-rated term) (Colloquialism) vagina; (Suru verb) to have sexual intercourse; to screw
Noun 
オモニ mother
Noun, kor: 
おもり clog
Noun 

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