(To) Hype up means to feel overly confident in yourself for a brief moment and lose control through being overly happy and having an adrenaline rush.
Mostly in cases you get hyped up to music and dance and sing or your friends making you feel like a bad bitch and you can't control your happiness.
"Amanda is hella hyped up look at her feelin herself on the dance floor"
"Man I'm so hyped up I can't stop smiling"
A term coined by "CoffeeMc'Coffee" that means: When a falsepromise is made and it is not properly fulfilled - it subverts expectations by delivering a lower-quality result instead of what was originally promised.
Person A: YO LISTEN! I GOT THE BESTCOOKIES IN TOWN! COME ON OVER RIGHT NOW!!
Person B: Oh cool, let's go there.
Person B: Dude.. what the heck? You're giving me cookie dough? YOU GOT ME HYPED UP FOR COOKIE DOUGH??