An ugly beeball is someone who believes they know the words to the song and sings the song so everyone can hear. Only to find out that the words that they are singing aren't even close to being correct and they get schooled by everyone around them about how the song really goes.
Ugly beeball is defined as someone who thinks they know the correct words to a song but don't and sings their own version.

Person singing in front of everyone: "... there's a bad move on the right..."

Everyone else: "What are you singing?! The words are, 'there's a bad moon on the rise'"
Singer: "Ooohhh... I thought it was a metaphor!"
by tratgypsy fdsafdsaa March 13, 2018
Get the ugly beeball mug.