Kendrick was a good kid (Saint) and the haters or gang members (Sinners) didn’t like that and tried to shoot him. Alternatively, the Catholic Church preaches that saints have a certain odor which they call the odour of sanctity, a scent often compared to the smell of flowers. Kendrick smells of this and his opponents are compelled to have Kendrick push up daisies so to speak.

Notice the usage of alliteration with saint, sinners, smell, start and squeezing.

A bird is on kilo of cocaine

Scarecrows are used a decoy in the shape of a human which is dressed in old clothes and placed in fields to discourage birds such as crows or sparrows from disturbing and feeding on recently cast seed and growing crops.

So Cassidy might be saying something like people don’t trust this dude, they think he’s a decoy or an under cover cop. Either that, or he’s implying that you’re scared to sell cocaine.