{adj. phr.} Comfortable; cozy. * /"Are you warm enough?" the boy's mother asked. "Yeah," he replied, "I'm snug as a bug in a rug."/
SNUG AS A BUG IN A RUG
Meaning of SNUG AS A BUG IN A RUG in English
Slang English vocab. Английский сленговый словарь. 2012