Popoff

To made wind, to flatulate, to fluff, to express your bowel gases.

Ew! Did you just popoff?

rumen

An Australian colloquialism of the Tasmania region, originating in England.
To be 'against the grain' or causing a disturbance to the status quo. A cheeky troublemaker; up to mischief.

Stop that, you rumen!

You are such a rumen.

What are you doing, you rumen?