肉竿 is read as にくざお (nikuzao) and means penis.
にくざお
nikuzao
にくがん
naked eye
にくじき
carnivorous
にくたい
the body
にくしん
blood relationship
にく
flesh
にくひつ
as written with a brush
にくたいてき
bodily
にくや
butcher's shop
にくせい
natural voice (without a microphone)
にくはく
closing in on (the enemy, first place, etc.)
にくばなれ
pulled or torn muscle
にくたいろうどう
manual or physical labor