- Being on friendly terms; friendly and intimate.
- Being on informal and friendly terms with someone.
The word "chummy" is derived from the word "chum" meaning "friend". it is first recorded in english in the 19th century.
- They've been chummy since they were kids.
- She's a bit too chummy for my taste.
- The boss and the employee were chummy, often seen chatting and laughing together.
- They became chummy after working on the project together.
- We"re just chummy, we"re not actually friends.