Learn and discuss different slangs everyday
hung up on
Definition: To be obsessed about something or someone.
Example: 1) I'm really hung up on Anna -- I can't get her out of my mind!
Etymology: If you are 'hung up' on something, you are caught and cannot move freely. 'Hung' is from 'hang', which means 'to attach from above' or 'to suspend'. So whatever you are hung up on, it has you on its hook, and you're swinging helplessly like a fish pulled from the ocean
PS: If mods/admins want to move else where please move it. :D. Thanks.