From sona pona, the Toki Pona wiki
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Denasalization is a sound change caused by no airflow through the nose. It can happen when a common cold blocks the sinuses.

In general, the voiced plosives [b d ɡ] are interpreted as the Toki Pona phonemes /p t k/. However, [b d] are also close to denasal [m͊ n͊], which could be allophones of /m n/.

Denasalization suggests that nena mi ("my nose") could be pronounced as [ˈdeda bi] (compare "by doze"). Without considering denasalization, this pronunciation would be heard as *teta pi (compare "pie toes").