(n.) Receiving any item, or service from someone which comes into play in a timely manner, or clutch moment.
(adj.) can also describe a very good action or occurence
Yo Bubba, I was talkin to a sexy bitch at the bars but she had this hideous grenade who wouldnt leave her side. Thank God Biz was there to take one for the team.... so on time.
Used to describe a place, thing, or concept that is favorable, trendy, or held in an overall high regard. The best of the best are considered 'on time', as they are not yet and may never become oversaturated or tired. Similar in vein to the likes of "fire", "heat", or "A1". Can be abbreviated to "O-T" to save time and breath.
An expression, often used as a greeting, referring to one's status of punctuality, and also pleasure, as well as success.
Dude 2: "What shakin', man?"
Dude 1: "On time and on top!"
Dude 2: "Totally, dude! The party just started, like, a minute ago! And nice Mercedes, by the way. Who's the babe?"