Divide is mostly used in math for splitting numbers through other numbers.
But is also often used by youth to diss someone or gamers while playing multiplayer games to describe them defeating an enemy. It is for example used in voice-chats of first-person-shooters like Cod In form of "to divide someone"
In this context it describes them literally splitting their enemy in half which would kill them resulting in their enemy's defeat.
"you're so dead man, I'll divide you even without a calculator! You little piece of ****!"
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.