1.
completely drunk, dead drunk, plastered
A mimetic word describing the state of being extremely intoxicated, to the point of being unable to function properly.
ぐでんぐでん is a mimetic word (onomatopoeia) that vividly describes the limp, wobbly state of extreme intoxication. The repetitive form emphasizes the severity.
Common patterns
Related mimetic words for drunkenness:
ぐでんぐでん suggests a more limp, collapsed state than べろべろ.
Related Words
Synonym:
べろべろ (very drunk)
Related:
酔っ払い (drunk person)
Compare:
ほろ酔い (tipsy (milder))