To do and/or booze something in an emphatic and violent tone. Often times, at a dangerously aggressive pace and blacking out.
Dude #1: "Bro, did you see dude #3 last night?
Dude #2: "Yeah, he was horsing it in so hard."
Dude #1: "He had to have horsed down at least 14 beers, man"
Dude #2: "For sure, he got the people going though. What an excellent evening."
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