Entry 2 senses Webster, 1913 chummy · IPA /ˈt͡ʃʌ.mɪ/ 01 adj. having the relationship of friends or pals. 1. having the relationship of friends or pals.[colloquial] 2. associated on close terms.[informal] Syn. matey, pally, palsy-walsy. — Syn. -- thick(predicate).