mucker
noun/ˈmʌkə(r)/
/ˈmʌkər/
(British English, informal)- a friend (usually a man's male friend)
（用作称呼）朋友，伙计 - It's my old mucker John!
是我的老朋友约翰！
Word Originlate 19th cent.: from muck + -er; sense (1) probably from the phrase muck in. Sense (2) is probably from German Mucker ‘sulky person’. - It's my old mucker John!