When someone is sloshed, they have had too much alcohol and are drunk. Friends say it after a night out; it is joking and a bit messy, not a word for a school essay or a news report. It is more British (and widely understood in other English-speaking places) than the usual American street words, though people elsewhere will still get it. It often paints someone who cannot walk straight, whose speech is thick — not only “had a glass of wine.” You can also meet sloshed as the ordinary past of slosh, when liquid splashes about (“water sloshed out of the bucket”). That is a different use. This drunk meaning is fairly new: it showed up around 1946, from the picture of drink sloshing around. People stretch it a little (“a bit sloshed” can mean only tipsy), but the core is drunk.

喝茫、爛醉（口語。台灣常說「喝茫」；課堂上較常寫「喝醉」）