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Continuing to drink at home after getting home from a bar. The opposite of frontloading, where you drink at home before you go out.
"Dude, you were really wasted last night at OJ's. You must have done some frontloading."

"Yeah, but when I got home I started backloading and it got worse. I woke up in the bathtub."
by Commentator X August 27, 2009