Abow is a Turkic and Arabic word, which is used in Sweden, Germany and some Balkan countries. You use "Abow", like "OMG" or when somethingsurprised/amazed you.
A: She cheated on him, while she was in the 6th month pregnant.
B: Aboooow, really?!
Abow basically doesn't have a definition, it's a slang and means the overnamed things.