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2.
The rumor that Belgians are extremely well endowed. Largely attributed to the intake of steak, mussels, fries, waffles, and of course beer. The average size for a male's penis worldwide is approximately 5.5in whereas the average size of a belgian male is approximately 6.4in.

See also the unfortunate Irish Curse.
Girl 1: "I hear Jacques has the Belgian Gift."
Girl 2: "Yea I know, I hear its over 10in long!"
by Joos V. August 10, 2006
 
1.
The fact that Belgian's have larger penises than many european nations.
Guy at bar: "Hey babe you know I have the belgian gift?
Girl at bar: "Really, you're coming home with me tonight!"
by Wim D. August 10, 2006
 
3.
Belgian's have large dicks. Also known as the Belgian Frite and The Belgian Endownment. Also the reason the French hate us.
Person- I am Belgian. My penis is 8.5in long.
Person two- Oh you must have the belgian gift!
by Belgian! August 10, 2006