Translation

piggu means "Pig" in English.
It's a katakanization, a loan-word.

piggu is normally written with katakana, as ピッグ.
piggu written with hiragana is ぴっぐ.
piggu does not have kanji.
Romaji pi ggu
Katakana
Hiragana

Orthography Notes

  • ッグ contains a small tsu which makes the consonant of the syllable longer.

Trivia

  • buta is also a derogatory way to call someone a "fat person."[1]

Further Reading

Wikipedia: ブタ (Pig)
  1. 豚/豕(ぶた)の意味 - dictionary.goo.ne.jp, accessed .