high-level 

Something very challenging or hard to do has been accomplished.

Boy 1 : Ornela won the difficult race.
Boy 2 : Yeah, such a high-level girl !

high-level by DaveGeeFR April 7, 2019

high-mucka-muck 

Opposite of Mucka-Muck which means small boy. High-mucka-muck means big boy.

"I am a high-mucka-muck, im very big."

high-mucka-muck by Jenny the butt April 10, 2019

High Sparrow 

When you’re high and you throw a paper airplane.

*in shrek voice: I was the throwing some gnarly high sparrows after I smoked that good kush.

High Sparrow by Gamecock43567 May 1, 2019

high-key 

Used in the same context/with the same tone as low-key, but with the opposite meaning. Like "very much".

Steve: I high-key love Nine Inch Nails.
Michael: Wow, I didn't know you were a big fan of theirs.

high-key by vejtics May 4, 2019

High Tide 

The period of time where your place is tidy enough to make a good impression on house guests.

Guests will be sailing through the door any moment so we need to bring the house up to high tide. It’ll ebb back down to its natural state of chaos in low tide as soon as they’re gone, which is fine, but I can’t even swing a cat in here right now.

High Tide by Ohcomeonman May 6, 2019

high three 

When someone missing a finger does a high five

high five, sorry, no, high three!

high three by fm369 May 20, 2019

High-pitched Growling

Any form of growling that sounds high-pitched.

The late Chuck Schuldiner (former frontman of one of the death metal pioneers Death) was known for usually using high-pitched growling in some of Death's music (this can be heard on Death's final album The Sound of Perseverance, especially on their cover of Judas Priest's Painkiller).

High-pitched Growling by CelticEagle June 1, 2019