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1.
When you take a dump in the shower and then have to squish it down the drain with your foot.

The term stems from a rumor - most likely false - about a deleted scene from the John Candy movie.
Man, I couldn't wait to get out of the shower and dry off, so I just Uncle Bucked it.
af FreeNachos 1. juni 2011
 
2.
An Urban legend present in the northeast. A sly character who's true identity is unknown to the law and public and is wanted by numerous police forces around the area for felonies against youths. Buck was prone to stealing youngsters for his own pleasure.
Kid 1: I think uncle buck is following us.
Kid 2: Nar man divin't buck iz!
af jabbadahutWEEKINDEEJABBA 11. august 2011
 
3.
an uncle buck, is someone who impersonates the late john candy... usually found to be a 23 yr old, balding, assistant manager from stockport named rob... coincidentally, they all work at gamestop in stockport too.
my god, you look like Uncle Buck
af Lord Jimmington 1. oktober 2005