look up any word, like the eiffel tower:
 
1.
As a male, having sex with a Hispanic female.
Ken: "Dude did you hook up w/ that fine ass Latina last night?"

Ryan: "Hell ya dude, I fucking crossed the border!"

Ken: "You went crossing the border? Nice. Slap hands!"
by Bro Fuss November 22, 2009
 
2.
When a man's cum drips out of a women's pussy and ends up in her asscrack.
When I was finished fucking this slam pig, she laid there as my jizz was crossing the border.
by Dradran July 06, 2013
 
3.
To have intercourse with ones sexual partner with one leg up in the air.
Dude you look tired.
I know, I was up all night crossing the border.
by StantheMan'08 January 23, 2008