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1.
an exclamation of surprise
'Yowsa! when did your little sis sprout them tatties?
by whiskymack February 21, 2004
 
2.
An exclamation of surprise, used in substitution for the word, "Fuck". Usually invoked when you have a bet that you will not use the "F word".
"Yowsa", cried Judy. That fucking hurts.
by keeldragger November 29, 2010