It is kinda the same thing when someone goes sicko mode, but this is just times a 100.
A rumor actually says that Waluigi is the father of almost all people on earth, and thats why nearly everyone can go WALUIGI MODE.
A time, initiated by Waluigi or another party who favors Waluigi. When Waluigi Time is in effect, all other actions at that moment are to be stopped, and all attention must be focused on the shenanigans and mayhem that the starter is allowed to cause. Can also be used to render another's argument invalid. One is also obligated to yell "waaaa" at random intervals. Crotch chopping is optional, but approved.
Inspired by the hilarious webcomic Brawl In The Family, when Waluigi made his eponymous appearance, and was so well liked he made repeat appearances.
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.