An Alabama Sparkle Sandwich is a sensuous act that involves one person fucking another person's ass to oblivion, then pouring Pop Rocks into the gaping rectum. After that, they eat out the asshole and try to get as many of the Pop Rocks' tingly mouth orgasms as they can.
Brett: Hey man, let's go over to Laura's house.
Ryan: Man that bitch always be trippin'
Brett: Yeah but I hear the girls are serving up some Alabama Sparkle Sandwiches over there...
Ryan: OHHH NIGGA HELLLLSS YEAH!!