Big Mac
/ˌbɪɡ ˈmak/originally and chiefly US
noun
1A trademark for: the largest in a range of hamburgers sold by McDonald's fast-food outlets; (hence allusively ) the biggest or best of a number of related things.
2A nickname for: the Municipal Assistance Corporation of New York City (now disused ).
Origin
1960s; earliest use found in Life. From big + mac-.