i'm just talking out my ass - You’re yapping like you’re in a debate, but you have no idea

You’re yapping like you’re in a debate, but you have no idea what you’re saying and you’re too proud to stop.

I told my friend the president is a talking parrot and then said, ‘I’m just talking out my ass.’

At the meeting, I said ‘the clouds are made of glitter,’ and now I’m just talking out my ass.

I explained the moon is a giant cheese wheel and now I’m just talking out my ass.