Meaning "Hella butthurt" or getting your feelings extremely hurt, being offended or getting all bent out of shape because of something petty or stupid.
Hbh stands for HeartBreak Hotel, which comes from a song. It usually refers to a person being rejected by his/her crush. It was invented by a girl who likes to use acronyms for almost any words.
Catherine: I'm checking in hbh tonight.
David: HAHA. Have a GOOD sleep.
Catherine: w/e f u
Basically HBH stands for heartbreak hotel. It was derived from a song and is commonly used when heartbreak happens. When that does happen all you gotta do is check-in to the heartbreak hotel.
Me: yo guysim so depresed
Dave: wsup g
Me: Time to check in hbh