What do the graffiti letters SRUIG mean?

Answer

SUR or SUR13 refers to the gang SURENOS {SOUTH SIDERS}SUR means south and the 13 refers to the 13th letter in the Alphabet M for their original name Mexican Mafia aka LA EME & since most of their member were from South California they called each other Sureno{southerner} If the number 13 is upside down it can look like a G. Gangs flip the signs for other gangs upside down as a sign of disrespect.

Face down is unpleasant position in prison!

First answer by Jimmy Neutron. Last edit by Jimmy Neutron. Contributor trust: 99 [recommend contributor]. Question popularity: 20 [recommend question]