ebriiĝi

Adjective, then a change of state. Ebria at rank 1207 is the adjective, drunk. -iĝ- means to become, so ebriiĝi is to become drunk. That is the whole derivation and there is nothing irregular in it. The double i looks odd on the page and is pronounced: e-bri-i-ĝi, four syllables.

Its opposite number is one letter away. Ebriigi, with -ig-, is to make somebody else drunk. The -ig- and -iĝ- article covers the pair properly, but the short version is that -ig- pushes the action outwards onto an object and -iĝ- keeps it on the subject. La vino ebriigis lin and li ebriiĝis are the same evening described from two ends. To sober up is malebriiĝi.

Register: it is the plain word. English has a hundred synonyms here, most of them carrying a wink, and Esperanto has one straight verb. Ebriiĝi is what a doctor, a novelist and a police report would all write. If you want the joking tone you have to build it yourself.

The drinking verbs, sorted. Trinki is to drink anything, water included. Drinki is to drink alcohol, and to do it as a habit. Ebriiĝi is the outcome. A drinkejo is where the middle one happens, and the -ej- suffix is doing the same transparent job there that -iĝ- does here.