A word often used for many things. The words original use was when you get scared or surprised, but recently it has been used for literally everything. (Like the wordliterally)
1. "I love you son!"
"Yikes"
2. "I love riven omg, what a fun champion"
Old school expression of fear or astonishment. 1941 is the earliest recorded use according to Merriam-Webster.com
Expression used to show an array of emotions, such as concern or disapproval, disgust, ridicule or embarrassment among others. Recent trend makes the word rather prevalent.