Wordnet 3.0
ADJECTIVE (1)
1. 
 (used informally) associated on close terms; 
- Example: "a close friend"- Example: "the bartender was chummy with the regular customers"- Example: "the two were thick as thieves for months"[syn: chummy, buddy-buddy, thick(p)]
WordNet (r) 3.0 (2006):
buddy-buddy
    adj 1: (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"
           [syn: chummy, buddy-buddy, thick(p)]