How to Say "testicle" in Spanish
The Spanish word for “testicle” is “huevo” — C1 level. This is a very common word in everyday Spanish.
English → SpanishC1
nounC1slang
anatomical slang (often plural: los huevos)

Examples
Me caí y me di un golpe en los huevos, ¡qué dolor!
I fell and hit myself in the balls, what pain!
No me toques los huevos, estoy de mal humor.
Don't bother me (literally: don't touch my balls), I'm in a bad mood.
Use in Plural
This meaning is almost always used in the plural form, 'los huevos,' especially in idiomatic expressions.
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