Gang Signs and the Vomit Touch

Last week I was walking my class back to our classroom from lunch, and noticed that a bunch of the boys were hanging back in the line. They had all four fingers crossed on both hands and were holding them up waving them around.  I told them to quit playing around in line, stop throwing gang signs and get into the classroom.  They all giggled and went to their seats.  I know they are not gang members, they are far from it, but it sure looked like they were pretending to be from the "west side".  Today, as I was walking my class back from lunch again, I heard one of the boys yell out to the kids in front of him to "cross your fingers against the vomit touch!!!"  I turned around and saw my whole class waving their crossed fingers around in the air, and all of a sudden it dawned on me that these kids have been crossing their fingers on the way back from lunch, trying to walk around this spot where some kid hurled in the hallway like two months ago in an effort to avoid contacting the "vomit touch!" Only in middle school!