Stands for Useful Idiot. Refers to ardent adherents of a cause who do not understand the cause and are then manipulated by the leaders of the cause into doing whatever the leader wants.
"Don't worry, that reporter is just a UI."
"He may look like a Congressman, but he is really just a UI.
A short girl who is a big nerd but is also really chill. Facetime calls are never boring a d she is always fun to be around, she will ether be very hype or very lazy and she has very swaggy music taste. She is very good to vent to and she can be the vibe of the party. She also SUPER DUPER OOPUER SMOOPER SHORT BY THE WAY
When you are feeling uli, it means that you are OBSESSED with weird speeches, like saying "DOORCHIME METAL OFF AND UPWARD CARROT TULIPS" over and over again at your friends, pets, siblings and even fax machines.
That girl was giving me uli vibes when she started singing "Yankee Doodle" by starting each word loudly and quietly at the same time with the letters E, X, Y and A.