When you are so confused your brain shutsdown or when the teacher looks at your work your doing your work in school
Teacher:*stands behind Jimmy when hes working*
Jimmy:windows e.x.e has shut down
Buh buh buh buh buh
Keep talking or I'm going to shove my yardstick up your ass
"Shut up George"
Commanding someone to stop talking or be quiet or telling them to stop.
To tell people to stop talkining
Frank: hi sister I’m back did u miss me yes? Yahooooooooo-
Linsey: shut up!