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1.
In its basic, literal sense, it means exactly what it says. The person on the bottom is leading the top, thus technically topping from the bottom.
Guy 1: So I heard Derek let you top last night?
Guy 2: Yeah, but even though he was bottoming, he still had most of the control.
Guy 1: Ah, clearly he was topping from the bottom.
by codytoads August 09, 2013