it means idiot
baka means idiot, and baka na can mean dumb and silly.
Cattle in Tagalog is "baka" or "hayop na baka."
baka na onna
'Anta no nii-san WA baka da'.
runitiku o baka-na
You may be meaning 'na da' if this is the case it means 'nothing' as in nada=nothing
anata no baka-na you're an idiot
baka niku means a cool pharese can you figure it out my food baka niku baka niku means stupid kitty!!!!!
baka means idiot. baka no desu is not how you say you are a idiot tho, anata WA baka desu means you are an idiot
baka francisco baltazar ...
If you insist on using 'baka' then it is followed by 'na' instead of 'no'. "Wo" is a completely different case, it is an accusative particle (a particle used to show 'object' of a verb), so your phrase would be 'watashi no baka na tomodachi'.
ばかな子供 (baka na kodomo) would mean "stupid/foolish kid/children" in Japanese. Idiotic little brat would be 'baka na gaki' and for little girl replace 'gaki' with 'komusume'.