Saying 'that' with a tone of 'what', usually used when the second mention of the thing you don't actually know what it is.
'Check out this thing, it's gonna make money for us!'
'Seriously what is that?'
The next day...
'Look how much fortunes I got!'
'With thwat?!'
'Seriously what is that?'
The next day...
'Look how much fortunes I got!'
'With thwat?!'
by R&M INDUSTRY May 28, 2014