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The words people (usually tourists) just shout out of excitement when they're going to Las Vegas; it is normal for people to slip on their sunglasses at that point and walk out in style.

Something fun you just say to annoy the heck out of other people or make a big scene (regarding your vacation plans) for no reason.
Mack: Woo! I am going to Vegas baby! *puts on shades& does the macho walk*

Robert: What the fuck? why is it that every time you say that, you gotta go through the damn theatrics?

Mack: I don't know, it's just fun.
by Yaruslev Kletsky June 10, 2008
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The 9-month end result of "what happens in Vegas;" Usually awareness of the Vegas Baby does not occur until a few weeks after you've left Vegas.
I went to Nevada and all I got was this dumb Vegas Baby.
by case42 March 19, 2010
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