Unicorn - A mystical being; most likely modern day horses.
Universe - Vast, never ending. Beautiful.
Understanding - Something that comes with experience, or effort (for someone who has already experienced but cannot process).
Ugly - Something that does not exist. Beauty is all a matter of perception. No one is genuinely ugly in terms of appearence.
Ukelele - Baby guitar.
Unblock - Allowing someone to be part of your social media life after having them blocked for so long.
Utopia - The ultimate place of happiness.
Unglued/Unhinged - Someone having a psychotic episode.
Unstoppable - Doomsday; the villian from Superman.
Upbeat - Happy, or at least faking feeling okay.
Untouchable - People in corrupt positions within government/corporate companies.
Upchuck - Throwing up.
Unfazed - Not caring about something; being desensitised.
Unzip - To pull down one's zipper (for some reason I think about it being on pants).
Unjust - People going to prison for 21 years for drugs but getting no jail time for raping someone.
Uncuff - To release.
Updo - A really uncomfortable hair style that I've only ever worn to band banquets that makes me feel like my face is rounder than it is.