A way of saying "very"...
often used by creepy irish women who like to talk about dirty priests and other mortal sins...
"Ooooh Brid those curtains are waa waa nice!!"
Someone who is always bitching and whining about someone or something. A crybaby. A whiner.
Dan: I just found out my girlfriend has been screwing my best friend.
Kevin: Stop being such a waa waa and kick his ass!