also: でこすけ · デコスケ
big forehead; fivehead; asshole
Derogatory Kantō dialect term for a person with a large or prominent forehead. The 'asshole' gloss reflects a strong insult usage, not a literal anatomical meaning.
That fivehead is bragging again.
He got mad when they called him 'big forehead'.
Common katakana-kanji mixed spelling; the reading デコすけ is restricted to this form.
Hiragana-kanji mixed spelling with the reading でこすけ.
Kanji spelling using 凸 for 'convex'; less common and may be considered ateji-like.
All-katakana spelling; usually written in kana.
From でこ (forehead, dialectal/abbreviated form of でこっぱち) + 助 (suke, a common suffix in male names or derogatory nicknames). The exact origin is uncertain, but it likely arose as a teasing or insulting nickname in the Kantō region.