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Here is the situation in a manga which includes the word.
A: ジョー どないしよう？ みんながおきたら... みんなが目をさましはったら...
B: ばっきゃろ！ さっきからなにをワナワナふるえてやがるんだっ。
I'm not sure if it is the same word as 「ばかやろ」.
Extra question: Is there any hidden meaning for the intention of changing the 「わなわな」 into Katakana form?
ばっきゃろ is the change way of saying of 馬鹿{ばか}野郎{やろう}. It means same as 馬鹿野郎.
I think there isn't hidden meaning for the intention of changing the 「わなわな」 into katakana but I guess the writer may accent the sentence by using katakana because it is all written in hiragana except ワナワナ.
