This is another way to say the gang called
the Crips. It represents that by
the 3 meaning C, the third letter in
the alphabet. The rest is pretty simple to figure out at that point.
Guy 1: "Yo, do you wanna join
the 3 18 9 16 19?"
Guy 2: "What is that?"
Guy 1: "You have to join it then
I'll tell you"
Guy 2: "Fine, sure I'll join"
Guy 1: "Why would you want to be apart of
the crips that's so dumb"
Guy 2: "I hate you"