Top definition
when a girl has fallen asleep after a night of vigorous sex, the man pulls back the covers, takes a hot steamy dump at the end of the bed, puts on his clothes, and leaves. She wakes up in the morning, sniffs around, pulls off the covers and: SURPRISE!!!
Friend A: You think that ugly girl you slept with last night is going to call you?

Friend B: Nah, I gave her a Sunday Morning Surprise, she'll never want to see me again.
by The Real Mr. Burns October 28, 2008
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