düündüm
Düündüm is not a standard Turkish word. In standard Turkish, the verb form meaning “I thought” is düşündüm, which comes from the verb düşünmek (to think). The form düündüm is generally considered a misspelling or typographical error, and it is not recognized in formal dictionaries or most educational contexts.
Etymology and morphology: düşün- is the verb stem for think, from which common Turkish past tense forms
Pronunciation: düşündüm is pronounced roughly as “dü-şün-düm,” with the ü as in ü in müzik and the
Usage and notes: If encountered in Turkish text, düündüm should be corrected to düşündüm. This form appears
See also: Düşünmek, Turkish verb morphology, Turkish orthography.