Top Definition
1. When driving through the McDonalds drivethrough, when they ask you what you want say A McStfu.

2. Something To say to somebody very annoying.
Drivethrough Lady: What can I get you today?
Man: Oh I'll just get a McStfu

Nerd: Hey Morse!
Morse: McStfu Before i kill j00.
by Jake Morse January 09, 2009
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