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1.
Laughing while having sex. Laughing + Sex = Slaughing.
Percy: Sex with you is great, but I get put off when it turns into slaughing.

Mildred: What can I say? Why don't you just use your hand vagina if you don't like it.
by Pseudonysus August 26, 2009
 
2.
Slaughing (verb); spending a naked evening with your loved one. Has to be someone you're actually in love with, though. Otherwise the term does apply. Anything but sex, though.
Leah: ..and we spent the whole night slaughing
Jenny: aw, really? whajja guys do?
Leah: we knitted.
by tuba (and kabir) October 27, 2007