Green’s Dictionary of Slang

drunk or drugged [play on pissed adj.¹ (1)].

1997		Roger’s Profanisaurus in Viz 87 Dec. n.p.: wazzed adj. To be pissed, puked or wanked, presumably.
2016		Independent 5 Jan. 🌐 Many competing coinages express the same notion. This can be seen in the [...] multiple synonyms for drunk or drugged (used by older students as well as school kids) such as carnaged, wazzed, hammered, hamstered.