A higher dosage of Xanax, usually the bar shaped scored white ones. This is street slang and has nothing to do with consuming an actual candy bar.
I was so freaked out that my doctor prescribed me some Xandy Bars.
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Diarrhea, the runs, urgent need to have a bowel movement.
"Oh man! That fast food last night gave me a backdoor mudslide this morning."
"I was so sick last night; I had a major case of backdoor mudslide!"
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