How to Say "penis" in Spanish
The Spanish word for “penis” is “carajo” — C2 level.
English → SpanishC2
NounC2slang
a vulgar and less common meaning

Examples
Me importa un carajo lo que piensen los demás.
I don't give a damn what other people think.
Después de la discusión, lo mandó al carajo.
After the argument, she told him to go to hell.
Esa casa queda en el quinto carajo.
That house is in the middle of nowhere.
It Lives in Phrases
You'll almost never see 'carajo' used as a simple noun like 'libro' (book). It's almost always part of a set phrase that you can learn as a single vocabulary item.
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