In the first game, the commentators braced for a "wombo combo", mentioning it at one point but not following up on it. SilentSpectre and Tang won this game.
In the second game, SilentSpectre (Captain Falcon, port 1) and Tang (Fox, port 2) played against Lucky (Fox, port 3) and Zhu (Fox, port 4) on Battlefield. Once Lucky was eliminated with a combo by SilentSpectre, putting him and Tang at 4 stocks and Zhu at only one, they started their combo on Zhu. Zhu fails his spacing on his back air, falling right on Tang. SilentSpectre hits him, then throws him down, while Tang upsmashes Zhu back into the Captain Falcon's grasp - he goes to a shine to upsmash combo. Zhu manages to DI, but his character dies after SilentSpectre's final Knee. Before that combo happens, the commentators start with remarks like "poor Zhu", "Happy Feet?" and "that ain't Falco!" as a reference to Zhu's Falco combo videos, "Happy Feet". They then start yelling as the combo unfolds, with HomeMadeWaffles shouting "Where you at?" several times into the mic. 
The video was then uploaded by Lumpycpu.
Origins of the term "Wombo Combo"
"Wombo Combo" is the name of a pizza usually served at the time at tournaments.
The term "Wombo Combo" originally referred to either a combo of Fox's Shine into upsmash, or any other impressive team combo. Once this combo occurred, the phrase's sense shifted to an impressive team combo that includes Fox's Shine into upsmash .
In popular culture
Several sentences in this video have made it into popular gaming culture, including "Where you at?", "Happy feet!", "That ain't Falco" and "Get yo' ass whooped". It was often re-used in League of Legends and Dota 2 to refer to a team smashing down on one single opponent who can't escape.