A term generally used to express exclamation, awe or anger at a situation. Not usually used to describe happiness. However, it may never be used to describe a person. You can never call someone a holy biatch. It is only used to describe situations.
1. HOLY BIATCH dude, I can't believe I actually passed that IAH class!
2. Where the hell is my juicy-juicy red lip gloss?! HOLY BIATCH!!!
3. Guy #1: Yea man, so some really messed up stuff happened last night. All I'm gonna say is that I woke up this morning and I had no idea where my wallet, keys or shoes were and I was lying alone in the middle of the forest.
Guy #2: HOOO-LLLLLYYY BIAAAATTCCCHHHHH
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.