particles - 手えふった - what is the "え” here?

Context:

Why "え" is used here? What does it mean?

Answer

The small ぇ in 手ぇふった is a way of indicating in writing the compensatory lengthening of the vowel in a single-mora word that sometimes occurs when the following case particle を is omitted in familiar speech. This is described in The Phonology of Japanese (Labrune 2012) in section 2.7.5, 'Prosodic Lengthening'.

So as Yang Muye says, it means 手をふった.