This is a common phrase used by London Roadmen to describe how they are overheated while wearing a heavy duty North Face puffer jacket during warm outdoor temperatures and/or indoors (clubs, pubs, etc.)

Big Shaq. The one and only. Mans Not Hot. mans can never be hot. The ting goes Skkkkkkrrrrraaaaaaa pot pot ka ka ka. skidi kit pot pot. and a pur pur purrr boom a saying( used by Big Shaq ) that means that a mans not hot, a man can never be hot, and that the man isn't hot.

When a young boy doesn't have weed on him.

a dead meme

A famous rap song from Big Shaq, the greatest mathematician ever.

A popular meme in which a rapper is not overheated while in a very fluffy jacket

It means that someone is infamous, similar to irrelevant