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1.
To "cock-block" someone. Mostly used in french, and although usually meant to describe a female who lafarges a man, the sexes can be interchanged. This means that the most common use would be for a woman who lafarges a man who is trying to "get with" either her or another female. It can however also mean a woman who lafarges another woman, a man who lafarges a woman, or a man who lafarges a man.

This word can be used to describe actions both with negative and positive results (i.e. if the dude was a big douche-bag, he can still be lafarged).

Also, lafarging someone can be intentional or accidental.
"Dude, the girl totaly just lafarged me. I was so close to hooking up with Cindy, but the lafargeuse came in and started talking about forest fires...MOOD KILLER!"
by L.J.R. October 14, 2009
 
2.
Spanish for 'the farge'.

See: farge.
"Dulce, de dónde ustedes encuentran que las praderas del Norte Skink?"

"¡Oh, amigo, lo encontramos en la Farge allá."
by Anch December 22, 2008
 
3.
A young girl full of STD's from sleeping around.
Boy 1: "i got herpes from that lafarge girl"
Boy 2: "She gave me the clap a month ago!"
by yabz August 17, 2014