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1.
when morbidly obese people "fuck" or have extremely hardcore sex (eww). the term comes from the idea of the fat (or flubber) is bounced or jiggled vigorously. its disgusting, but its real.
If two sumo-wrestlers hooked up it would be considered flubbering
by cmsg January 08, 2011
 
2.
acting foolish at 4am on new years
dam man, he is flubbering too much!
by jelly mere January 01, 2010