Homie can you show me where the gosh darn bath salts are
Cause I'm sick of sniffing asphalt
Bath salts produce a high similar to amphetamine or cocaine and can be snorted. (Note: this is just the street name for the drug — if you sniff the bath salts your girl uses, you’ll just smell lavender!)
The “sniffing asphalt” could be saying people push him down so much that his face is constantly on the asphalt as if he’s snorting/sniffing it.
This is likely saying that, while under the influence of bath salts, he would be violent enough to fight back against the haters. Bath salts were in the news recently when a man under the influence of the drug ate another dude’s face. It took four bullets to stop him!
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