A violent emotional reaction; a conniption; an over-the-top angry response to a situation. More seismic than simply "he shit his pants." A square shit is painful and difficult, due to the presence of pointed corners at the edges, so to "take a square shit" means one's reaction to a situation or its outcome must be equally painful and likely beyond hope.
"My dad took a square shit when he saw what I did to the front bumper of his car."

or

"I took such a square shit when I heard I was working for Matt New Year's Eve."
by Unkie Al December 29, 2005
To express that the odds are slim.
Speaker 1: "I'm gonna kick that mother fuckers arse. I dont care how many UFC titles he has."
Speaker 2: "You've more chance of turning out a square shit my friend!"
by Nicky James. October 10, 2007

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