2 definitions by Imperial18

Top Definition
A male rubbing ones own grundle with another males grundle, behavior closely associated with two males giving up sexual realations with women to play " word of Warcraft " or " Aion "
Matt and Greg are the biggest grundlebumpers in the world!!! They would rather play Aion then go out and get laid
by Imperial18 October 01, 2009
A falupa, a secondary pelvic stomach covering a womens genitalia
I was walking down the street and saw an over weight women and was amused at her floppylapflounder
by Imperial18 October 01, 2009

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