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1.
When you burp after you've been smoking and smoke comes out. A smoke burp.
Dude, did you see that? Javier just did a smurp.
by Corey Dunn December 13, 2007
 
2.
When A large SUV full of people, usally hispanic, pull over to the side of a road and decide to throw a beach party. They will usaully be a large number of children playing in a very shallow and thin stream. There will be a large number of hispanics dressed in pastel cowboy gear and drinking large qtys of "Bud Light".
I was on my way to work today, and I saw 6 car loads of mexicans smurp'n.(Spontaneous Mexican Roadside Picnic)
by Macross March 27, 2005
 
3.
When you burp and it smells like sperm (due to the fact you swallowed sperm).
We knew Carrie's date must have turned out well last night because when she smurped today we all smelled it.
by Luckygirl April 27, 2007