You can't beat the Irish humour.
We take the mick out of anything, and basically go roundabout ways of explaining things.
Well, this Dublin comedian, Emma Doran, decided to ask her dad all about aul fella language – and the outcome was pretty funny.
From phrases such as 'grand', which means your dad just doesn't want to talk to you, to telling you 'ask your mother', which means he doesn't want to be bothered, there's a lot of hidden meanings.
And frankly, most of them just mean he wants you to leave him alone.
Have a watch of Emma's video and let us know if your dad speaks 'aul fella language'.