Nonstandard or humorous double past tense of drown, formed by adding -ed to the already-past 'drowned'; used in some dialects and in folksy speech.
A folk double-marking of the past tense (drown → drowned → drownded), similar to 'been went' or 'did saw'. This represents overgeneralization of regular verb patterns in non-standard speech.
Words like 'drownded' aren't 'mistakes'—they're how languages naturally evolve when speakers extend regular patterns to irregular verbs, and this same process created many of today's standard verb forms centuries ago!
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