Paf : adj. family (or paffe). To be paf: to be drunk, drunk.
The expression “to be bast” means to be drunk.
Ce paf is an abbreviation of the past participle paffed from the verb paffer ou stuff which, at the end of the XNUMXth century, meant "to intoxicate", and which is also found in the pronominal forms paffle ou stuff up (also with the meaning of "gorging on food and wine").
But the origin of these verbs is debated. For many lexicographers, they are a deformation of piff ou stuff yourself with the same meaning. But for Lorédan Larchey, stuff meant "to fill up", the paf having been a generic term to designate a alcoholic drink in the middle of the XNUMXth century.