bosker adjective 1noun 1forms 3 adjective1 •(slang, no longer used) excellent; wonderful; bonzer.They were bosker horses. Until I went to work for Bill I didn't know how good racehorses are. — 1946 noun1 •(slang, no longer used) Someone or something impressive and wonderful.“You're a bosker, Millicent," Tom exclaimed fervently. — 1912 formsboskers · more bosker · most bosker
