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1.
Making a mistake. Usually used with a mostly insignificant mistake

Plural: oopsy daisies
Jack:oopsy daisy, just dropped my pencil
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Steve: bob what did you do?!? You just deleted your english essay

Bob: Oh crap.....i guess i just picked myself a bunch of oopsy daisies.
by neckaphobia February 23, 2011
 
2.
To come all over a girl's face when she asks/begs you not to.
Pronounced "up-see-day-zee"
girl: Please, don't come on my face
bloke: OK...oopsy-daisy, i just did...
by B08z0r3llo August 14, 2005