As already shown in Syntax 1.2.3.5., doubling of wh-signs is possible in DGS. The function of wh-sign doubling is emphasis.
wh
why ix2 ix(dem)a clothing like why
‘Why do you like these clothes?’
Not only simple wh-signs can be doubled, but also more complex wh-constructions such as seen in the example below. In content interrogatives with doubled wh-signs, the non-manual markers spread over the whole sentence.
wh
how_exactly go party how_exactly
‘How exactly did the party go?’
Doubling constructions emphasize request towards the interlocutor to get a response to the question.