From Longman Dictionary of Contemporary Englishshinnyshin‧ny /ˈʃɪni/ verb (shinnied, shinnying, shinnies) [intransitive] American English → shinny up/down→ See Verb table
Examples from the Corpus
shinny• The boy panicked and tried more desperately to shinny up the mast.• His brother was eight and spent two days learning how to shinny up to the office.Origin shinny (1800-1900) shin “to climb holding on with your legs” ((19-21 centuries)), from shin (noun) 