b-llll-rrr-g
A loud and messy way of talking that sounds like you're trying to scare someone with your mouth.
My brother said 'b-llll-rrr-g' when he saw a spider on my face.
She yelled 'b-llll-rrr-g' because her pizza was cold.
He said 'b-llll-rrr-g' when his dog ate his homework.