Jisho

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Particle
1. indicates emotion or admirationFemale term or language, at sentence end
2. indicates emphasisKansai dialect, at sentence end
3. wah!
4. boo!
Wikipedia definition
5. Wa (kana)わ, in hiragana, or ワ in katakana, is one of the Japanese kana, which each represent one mora. It represents [wa wa] and has origins in the character 和. There is also a small ゎ/ヮ, that is used to write the morae /kwa/ and /gwa/ (くゎ, ぐゎ), which are obsolete in contemporary standard Japanese but still exist in the Ryukyuan languages. Katakana ワ is also sometimes written with dakuten, ヷ, to represent a /va/ sound in foreign words; however, most IMEs lack a convenient way to write this.
Read “Wa (kana)” on English Wikipedia
Read “わ” on Japanese Wikipedia
Read “Wa (kana)” on DBpedia

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