chummy

Adjective

• (used informally) associated on close terms
  • a close friend
    
  • the bartender was chummy with the regular customers
    
  • the two were thick as thieves for months
    

• (used colloquially) having the relationship of friends or pals

Related words

• Synonyms: 
  buddy-buddy , thick(p) , matey , pally , palsy-walsy