It is used for cars and the type of roof they have, the opposite is a convertible as it can change its roof and is not a constant hard top.
"I prefer a hard top car to a convertible"
"I don't think you know what a top is Bob"
This is what the once-relatively-very-popular Let's Play Youtuber, "jacksepticeye" says at the start of his YouTube videos on Youtube.com (owned by Google (owned by Alphabet Inc.))
jacksepticeye: Top of the mornin' to ya, laddies! My name is jacksepticeye and today we'll be watching furry hentai
other person: ...
Something that does not exist.
Jimin’s top lip is covered with concealer to appear nonexistent.
Army: Did you know Jungkook has a pet fish?
Other Army: That fish is as real as Jimin’s top lip.
an instrument used for smoking marijuana,
the head of the pipe, bong, water fall.
pass me the fukkit top
A sex position where the male sits on top of the woman while she's lying down, faces away from the woman, and bounces up and down on nothing (while he has a boner)
Bro I totally did boner on top with your mom last night