look up any word, like half chub:
 
1.
A McDonald's Big Mac that has had the middle bun replaced by a Filet-O-Fish patty. Also referred to as a Redneck Surf n' Turf.
My friend tricked me into eating a Fish Mac and I had to sit on the toilet for 2 weeks.
by J_Cut April 23, 2011
 
2.
One of the types of sandwiches in McDonald's available IN EUROPE where you get a piece of fish instead of cow/pig meat in it.
There she was, pink clad, hair dyed stupid blonde, bolting Fish Macs one by one.
by necrotism June 05, 2006