explosive barney
Diarrhea that is so bad it explodes out your ads-you have no time to get to a toilet. The Barney refers to Barney Roble as in the Flintstones and references the slowness of driving like the Flintstones when you have to shit right now!
OMG i ate that whole burrito with the hot sauce and now I've got explosive Barney--I need a barhroom NOW!