Skip to around the 1:10 mark to get to the moment in question.
Wham-Sauce (\ˈwam-ˈsȯs\): A forceful but non-threatening blow upon an unsuspecting party. In a sentence:
"He just wham-sauced the meet crew! It doesn't matter, he's a national champion!"
"Carla really wham-sauced that plate of pizza rolls. They never saw it coming."
In noun form:
"Kendrick Lamar just slathered an extra-helping of wham-sauce all over us by releasing an album unannounced."
As an adjective or modifier:
"Ironically, this weak-ass hot sauce is the least wham-sauce thing I've ever tasted."
The words "wham-sauce" now don't look like words after reading them this long. You're welcome.