Что значит фраза "Make out hill"?

Make out - многозначный фразовый глагол.

Поэтому невозможно дать точный перевод не зная контекста.
Это может быть и условное название укромного места для для секса
в том или ином виде.

Например, холм (либо другое какое место), который называют "Холм поцелуев":
Something you don't know about San Antonio is that a while back it started that you take your girlfriend to this hill which they call 'Make Out Hill'; and well you know...
Глагол make out означает бурные поцелуи и ласки "без проникновения".

Кроме того,

1.make out - разобрать
It is manned, but sensors cannot make out specifics.

2.make out - сделать
What can you make out of this?

3.make out - понять
I could never make out what it was they were fighting about.
Can't make out a thing.

4.make out - разглядеть
With a glass, you can make out the people.

MakeOutHill

An expression used in social media by the deceased rapper XXXTENTACION. The meaning of “makeouthill” is referring back to his hometown of lauderhill Florida and how this was an objective for him to make it out of this city of indigence. The rapper is encouraging his fans to make good of their struggles or difficult situations.

-- I don’t to live like this. I just want to “makeouthill.”

2

Make Out Hill

A designated area(doesn't necessarily have to be a hill)where the neighborhood teens sneak out in the middle of the night on the weekends to touch each other. It sucks for you if one of these is near your house .

-- Meet me at make out hill tonight at 11 o'clock!

сделать выход с холма = Сделать ноги = Найти выход.