person

a jackass; a dumbass; a moron; an imbecile

a fool, an idiot / uselessness, futility / a tool used for counting coins

foolish, idiotic, stupid, ridiculous / useless, futile

to not take seriously; to look down on

idiot, moron, nimrod

April Fools' Day

Alternative spelling of 馬鹿野郎 (“stupid man; prick; dick”)

Someone who has poor handwriting, especially poor knowledge of writing kanji characters, due to habitual use of Japanese computer text input methods rather than pen and paper.

someone of that type, someone who does that