The term 'seriously ticked' is an expression used to describe someone who is very angry. It can be described in two words, 'LIVID' and 'IRATE'. LIVID means extremely angry, while IRATE means very angry. Both words are used to describe a person who is very upset and has a strong emotional reaction to something. In other words, someone who is seriously ticked is very angry and has a strong emotional reaction to something.