Australian Slang
Relevant to card games.
A trump is a playing card which is elevated above its usual rank in trick-taking games. Typically, an entire suit is nominated as a trump suit; these cards then outrank all cards of plain (non-trump) suits.
Any sort of action, authority, or policy which automatically prevails over all others.
So, being surprised (or "shitting yourself") made that the immediate prevailing thought above all others.
I stepped on a snake today. Shit was trumps!
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