clown, tomfool, bumpkin, (usually male) person who is naive, silly, and/or ridiculous
From the vernaculars of North Rhine-Westphalia. Possibly from the lullaby verse heia popeia, implying a “benighted” person.
Ćwicz mówienie i zapamiętywanie " Heiopei " i wielu innych słów i zdań z niemiecki .