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slang To vomit. Geez, I thought I was going to fling up on that boat—I felt so seasick!
fling something up (in something)
to throw one's arms or hands up in an expression of some emotion, such as despair, horror, disgust, resignation. She flung her hands up in despair. She flung up her hands and cried out for help.
Sl. to empty one's stomach; to vomit. I was afraid I was going to fling up. Who flung up on the sidewalk?
in. to empty one’s stomach; to vomit. I was afraid I was going to fling up.