Looking on the internet deeply has found these results:

what do you passtime? is the most popular phrase on the web.

what do you do passtime? 11 results on the web	what do you passtime? 14,300,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Pleasure is the only passtime	Pleasure is the only passtime

what do you do passtime?

11 results on the web

what do you passtime?

14,300,000 results on the web

More popular!