can be inserted into any sentence, replacing any noun, verb or adjective. can be used as a sentence on its own, with emphasis added using a question mark, period or exclamation point. in crisis or haste shig can be used.
The most common uses of these sentences happen (mostly to me) while laying in bed at night.
"Oh, that one boy, Shiggity Sean, what a dreamy man. I can't wait to stare at him later... Oh, Shiggity Sean!!!"- Mom walks into bedroom asking if you are okay, you say yes, she leaves, and you keep fantasizing about the almighty Shiggity Sean.
An expression used in response to a request for attention, equivalent to "Yes, how can I help you?" or "Oh, hello, do you have something you wish to converse with me about?".