How to Say "buttock" in Spanish
The Spanish word for “buttock” is “nalga” — A2 level. This is a very common word in everyday Spanish.

Examples
Me duele la nalga derecha después de correr tanto.
My right buttock hurts after running so much.
El doctor me puso una inyección en la nalga.
The doctor gave me an injection in the buttock.
El bebé tiene un lunar pequeño en la nalga izquierda.
The baby has a small mole on his left buttock.
Use 'the' instead of 'my'
In Spanish, when talking about body parts, we usually use 'la' (the) instead of 'mi' (my) if it's obvious whose body we are talking about. For example: 'Me duele la nalga' instead of 'Me duele mi nalga'.
Singular vs. Plural
Use the singular 'nalga' to refer to one side (one cheek) and the plural 'nalgas' to refer to the whole bottom.
Confusing 'nalga' with 'culo'
Mistake: “Using 'culo' in a doctor's office.”
Correction: Use 'nalga' or 'glúteo'. 'Culo' is considered rude or vulgar in many Spanish-speaking countries, while 'nalga' is perfectly acceptable and neutral.
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