We don't have synonyms for maccas yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are meccas, macca and macas.
(n) :
(surfing, slang) "Macaronis", a surf break in Mentawai Islands Regency, West Sumatra, Indonesia.
(n) :
(Australia, Fiji, New Zealand, slang) Alternative spelling of Macca's (“McDonald's”). [(Australia, New Zealand, Fiji, slang) The McDonald's chain of fast food restaurants; one of these restaurants.]
(n) :
(surfing, slang) "Macaronis", a surf break in Mentawai Islands Regency, West Sumatra, Indonesia.
(n) :
(Australia, Fiji, New Zealand, slang) Alternative spelling of Macca's (“McDonald's”). [(Australia, New Zealand, Fiji, slang) The McDonald's chain of fast food restaurants; one of these restaurants.]