Referring to the sex act "69". As the "bj" is obviously a blow job :0 and taco bell is also obviously eating a chick out () . Can be used in school because teachers are idiots.
Guy 1: Hey man, what's up?
Guy 2: Nothin much, but last night, man I went to bj's and taco bell.
Teacher: Scuse me young man, what does going to bj's and taco bell mean?
Guy 2: Wow, you really don't know? It means I ate taco bell at a BJ's, obviously.
Teacher: Ohh, I'm obviously an idiot.