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1.
To abandon a heterosexual lifestyle for a homosexual one. May pertain to men or women.
Cynthia told me she's fed up with men, and might jump the fence.
by Rod Brock July 24, 2006
 
2.
When a man pulls his genitals over his boxers and pants in order to urinate. (as opposed to leaving the top button done and unzipping the fly)

Most commonly done with button fly pants.
"Dude, I forgot I was wearing these new button fly pants- I needed to jump the fence once I got infront of the urinal"
by vishnook December 19, 2012