Can anyone tell me, please, what does yumurcak mean and when can it be used?

According to Tunci, yumurcak = naughty but sweet child

Click here for an explanation of the cak suffix

yeap it means naughty but sweet child but it usually used for toddlers, rarely used for kids, never used for any child who is older than 5 years old; plus its a old saying, it reminds any turk of a film character in an old turkish movie.

i dont recommend you to use it, it could be awkward  

Merhaba,

The word "Yumurcak is a combination of two individual words as "Yumurta=egg" and "Ufak(Ufacık)=small(tiny)

Yumur-ta = Yumur-

Uf-ak=-ak

Yumur-C-ak=small egg

This is used for sweet or naughty kids to claim the adults´ like on them.