Waa is likely misspelled.
Waa has no English definition.
As a verb naa
is an alternative spelling of lang=en.
naa
English
Verb
(head)
(Geordie)
Anagrams
*
----
waa
English
(onomatopoeia)
Interjection
(
en interjection)
The sound of a baby crying (often written twice: "Waa! Waa!").