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2.
The act of leaving your couch and going to McDonalds to get some food. Usually done in pairs/or group during the night.
Robbo: Hey bro, I'm hungry. You up for a Maccas run?

Johnno: Aight bro, lets go
by Jimmy Man January 04, 2011
 
1.
Dropping everything to hit McDonalds up for some food. Usually best done in pairs.
1. Hey fat cunt, you up for a Maccas run?
2. Maccas hit anyone?
by aggot September 02, 2003