When someone shows up uninvited to an event. Often interjecting and attempting to change the event plans.
-How was lunch today?
- Not so good, we got McBigged by Steve so it was awkward.
- Yeah I hate when that happens!
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A burger that is so large that it is hidden from the public and is 1 of the 17 secret menu items at McDonald's, and you can only get it if you call a McDonald's at 3 am.
"yo, can i get a uhh a McBig please?"