Abbreviation for the notorious San Diego gang.
Create Some Rage.
Is what most go by, other may degrade the group and call them Crack Smoking Rednecks, or Clairemont Square Rats.
Or can be used in the context of stating, "oh that was CSR" as in the sense that it was prime top quality.
"Did you just pack me a bowl?"
"Not any bowl, a CSR bowl dude"
"Oh tats dude, thanks"