v. intr. (creatively offensive) defecate, esp. into a toilet. The epithet elicits an image of a puffy, floating, brown log, and further revolts by identifying feces with food. In the latter respect, it resembles the expression, "pinch a loaf."
My girlfriend came out of the bathroom, and I said, "what did you do, float cake?" She laughed automatically, but then after a moment's reflection, looked at me with disgust and said, "ugh, float cake!"
by tneveca August 25, 2009
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A combination of "Float your boat" and "Take the cake."

i.e., can be used in a positive or negative fashion, meaning something that works.
"Man, Samaire sure is lookin' fine this evening. That girl really floats my cake."

"I tried to get my sister to go out with you, but apparently that idea didn't really float the cake."
by freebs July 10, 2013
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