Used to define some thing that has happneded, about to happen or some thing that has been said between two people.
This 'Some thing' Will be more than awesome, only one word will be able to define how awesome this something is, and that word is Shibbie.
The word Shibbie is usaly followed by a Hi-5.
Ally: Dude my girlfriend was round last night, I bit the cherry muffin!
Whimsical person demanding that Strong Bad writes a song about him. This leads Strong Bad to throwing a tantrem, explaining that he cannot fullfill everyone's freakin' whim (asking him to write a song about them, dance around in something purple, or send Trogdor to their house), which leads him to writing his first Sibbie-related hit "I will never, ever, ever write a song about Sibbie", which Strong Sad downloaded off the net, and made Strong Bad throw another fit, which in turn inspired the second Sibbie-hit "I freakin'hate Sibbie"!