Why is it der Popo?

Popo ends in -o, but that ending doesn’t settle the article: in a German dictionary, 45% of -o nouns take das, 43% take der, and 11% take die. So learn it with its article: der Popo.

Which endings you can rely on
Sense 1
der

Meaning

[1] Colloquially: buttocks (part of the human body that is used to sit on)

[1] umgangssprachlich: Gesäß (menschlicher Körperteil, auf dem gesessen wird)

Examples

[1] But she has a sweet bottom

[1] Die hat aber einen süßen Popo.

Declension

1 Singular Plural
Nominativ der Popo die Popos
Genitiv des Popos der Popos
Dativ dem Popo den Popos
Akkusativ den Popo die Popos

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary