An exclaimation refering to something shameful to the exclaimer, but that would for some reason be more shameful to not exclaim.
Often related to a specific sitcom like situation.
Getting back a maths Exam: "Yay i got 3%!"
Farting in a room of only guys and yourself: "It was me!!"
Shitting your pants so badly in public that bubbly shitclouds flow from your boot cuts like brown dry ice : "I shit mah pants!! I shit mah pants!!!"
All of the above examples were of people who necessitously chose exshamation over regular shame.