The commonly used phrase "stucking on" is frequently encountered in informal speech and writing. However, the spelling of this word may be problematic for some, with few realizing that it is incorrectly spelled. In terms of pronunciation, "stucking" should be spelled as "stuck" /stʌk/ + the present participle "-ing" /ɪŋ/. Therefore, the correct spelling is "stuck on". It is important to use proper spellings, as incorrect spellings can create confusion and detract from the credibility of the speaker or writer.