Perhaps from gangle, from the dialectal gang (“to go, to walk, to proceed”).
gangling (comparative more gangling, superlative most gangling)
- Awkwardly tall and thin, ungraceful.
- A gangling teenager.
From gang + -ling.
gangling (plural ganglings)
- (nonce word, nonstandard) A member of a gang.
2007, Edward Estlin Cummings, Eimi:
- "Well, we'll meet in New York and you can see what's left of me! Bon voyage" the ganglings smirked & just beyond Grand, bang into not — da.