A person who spents a remarkable amount of time with his head on the ground. Someone who passes out easily and/or often due to alcohol, drugs or beatings. Also a homeless person living in the worst way without the ambition to improve.
That jerk tastedthe street again. If he can't stand it, he should drink less. What a street taster!
When an illegal drug crew gets a new shipment and/or a new supplier, it is not uncommon for them to have one day where they give out "testers", essentially free samples that junkies will ultimately comment on the quality of. It ensures the dealers or not being ripped off by suppliers and can also cause some junkies to become loyal to that crew and their product. Junkies are often very excited for tester day, since it means a rare free high.
You know your way around the streets, you’ve seen the shit you needed, you’ve done your dirt and you’ve got out alive. You’ve been to war with your neighbors, fought through rough times. More importantly, you stay silent.