also: ちんぼ
Vulgar or childish word for penis; used mainly by children or in very informal, often crude, adult speech. Not appropriate in polite conversation.
A little kid was laughing while saying 'chinpo'.
That manga is vulgar, full of dick jokes.
Used for the penis as a long, cylindrical object.
Most common katakana spelling; often used in casual or childish contexts.
Hiragana spelling, also common.
Variant pronunciation and spelling; less common.
Hiragana variant of the less common pronunciation.
The exact derivation is uncertain; likely a sound-symbolic or baby-talk formation, possibly related to ちんちん (penis, childish).