chummy

from WordNet (r) 3.0 (2006)

chummy
    adj 1: (used colloquially) having the relationship of friends or
           pals [syn: {chummy}, {matey}, {pally}, {palsy-walsy}]
    2: (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)}]

from The Collaborative International Dictionary of English v.0.48

chummy \chummy\ adj.
   1. having the relationship of friends or pals. [colloquial]

   Syn: matey, pally, palsy-walsy.
        [WordNet 1.5]

   2. associated on close terms. [informal]

   Syn: thick(predicate).
        [WordNet 1.5]