A word used by members of a fandom to express deep emotion. The word originally came from fangirls (and occasionally fanboys), misspelling "crying" because they were too upset over something. Now the word does not just apply to sadness, but to awe, excitement, frustration, anger, and admiration as well.
"OH MY GOSH, LOOK AT THE PURE CINNAMON ROLL! I'M CRYIGN!"
"LOOK HOW PURE HE IS! I'M CRYIGN OVER HIS INNOCENCE!!"
Used either to express deep emotion, or sarcastically remark on something that's supposed to make you cry, but didn't.
"MCR came back, I'm literally cryign rn."
"Nobody came to my birthday party!"
"So sad, I'm literally cryign rn."