Broken, cracked, or in poor condition; or colloquially, drunk or intoxicated.
From crock (a broken piece of pottery or an old, broken thing) plus -ed. Also possibly related to dialectal meanings of crock as illness or weakness.
The slang meaning 'drunk' likely comes from the comparison to a broken pot—your functioning is similarly compromised—showing how physical metaphors dominate alcohol vocabulary across cultures.
Complete word intelligence in one call. Free tier — 50 lookups/day.