"Walla" is the French Canadian pronunciation of of the French word "voilà"--a regional pronunciation that trickled down into the States because the two countries share a border.
To chalk it up to a "stupid American" pronunciation because (paraphrased) "Americans can't pronounce anything not English--and barely that" is a flat out display of ignorance and a glaring lack of diligent research; it's quite possibly an ironic display of one's own "stupidity".
To borrow from SA's example: "So I was on a cruise around the world and we were heading towards American territory again. This lady on the ship asked me who the stupidest people in the world are. Before I could answer, a stupid guy surfing UrbanDictionary pointed at himself and said 'Walla!' in his best pretend Canadian accent."
A person who hangs around 2 dollor whores and peep shows in Amsterdam waiting for some freebe action jackson.
Usually carries tissues wears jogging bottoms!
Christopher Walla is an awesome guitarist/vocalist for the best band in the world, Death Cab For Cutie. Dating the photographer/director Autumn De Wilde, he is from Washington State where the band currently resides.
Christopher Walla is sooo hot!! too bad he's dating Autumn De Wilde.