Jack Blacking it
When someone sings like a dorky kid with a squeaky voice and weird noises, it's called 'Jack Blacking it'. It's like a metalhead's version of a toddler's tantrum.
My cousin tried to 'Jack Black it' at a concert and sounded like a broken kazoo.
At the party, my friend started doing 'Jack Black it' and no one knew what to do.
I tried to 'Jack Black it' in the shower and my mom called the police.