To be in a sexual position where one person is standing and the other is upside down being held by their ankles by the aforementioned participant.
"Dude, I totally saw Charlie and Fiona having a flomber behind the bikeshed earlier"

"Brian, do you want to go swimming today?"
"No sorry, I'm going for a flomber"
by Commune Bandits April 21, 2010

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