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Its a phallus. Its most likely large, and quite floppish.
Also, used often do to the manner in which it rolls off the tongue.
I truly desire to be in posession of a big floppy donkey dick. Mines tiny and under-used.
by Big-Floppy-Donkey-Dickless September 30, 2003
316 107
Just what it sounds like....
"That donkey has a really big, floppy dick!"
by xenowhacker June 02, 2004
122 64
1) The large sexual organ a male donkey has

2) A colloquial term for a gentleman's large phallus

3) A variation upon the British game 'Bogies' wherein members of the class/group have to shout 'Big Floppy Donkey Dick' as loudly as possible without either being caught doing so or getting embarresed in the process. The winner is the person who shouts it the loudest.
Jack: (loudly) BIG FLOPPY DONKEY DICK!!!
Teacher: Get out Jack!!
Dave: Ha ha ha...
by Simon Young March 25, 2008
80 29
Insult to someone who is a whore.
You see that slut. She's so nasty she would suck a big floppy donkey dick.
by Amanda Van Valkenburgh December 06, 2005
55 101
i have 1 it is great it gets stuff under the skin, it smells. I like to play with it
by judith November 03, 2003
45 187