It is very much a local word I hadn’t heard of before, but context was most certainly enough. My own native language does not have such nice words for getting shitfaced/munted/pissed/wasted/etc, our euphemisms roughly just come down to drinking yourself into a casket (it’s said “into a box”, but everyone understands it’s supposed to mean casket) or just getting blackout drunk so you don’t remember shit. Our language has some 14 noun cases, so it just instead of the cumbersome “into a/an/the X” of English, we’d say X-i or X-sse. So if “box” is “kast”, we say “kasti” and if a slang term for a memory blackout is “mällar” or “mälus” (literally: in memory), we say “mällarisse” or “mällu” (literally: “into memory”)