meaning - XOXO means "hugs and kisses" but why? - English Language ...
My first guess was that it's some sort of an onomatopoeic abbreviation, but Wikipedia points out that there's also an XOX, where the O means a hug. Apparently, you can also write XOXO, or XOOX, or in fact combine the two letters in any way you like. (The strange thing is that personally, I'd rather associate an O with a kiss and an X with a hug than the other way round.)
In my opinion, it has to do with signing a letter using XOXO to mean hugs and kisses. Some sources claim that X has religious connotations and mean 'Christ', so by signing X, you're actually saying In Christ's name, I assert___. Some sources say that the signee would then kiss the X to demonstrate that what was written in the document was true.
The newest I can think of would be XOXO (O and X are crude visual representations of a hug and a kiss respectively). I know it's arguably not a word, still... Then we have words like U-turn, T-bone and V-neck, which are named after the shape of the letter (as against words like X-rays, A-team and B-boying)