1. Because I find your jokes are fucking lame that I had to lol, sarcastically.
2. Because you try to do something stupid, trying to get some attention and humour me, but failed epic-ally. Lol you for that ya?
3. Because whatever you replied to whatever I said was UNRELATED. No link. Lol.
4. Because after Number 3, I have nothing to say to you, so I reply you a lol.
5. Because after I find you very lame and shit, I’m lazy to entertain you, so I lol you, again.

Btw, this has nothing to do with anyone in particular. Really. My girlfriend gave me the idea so (L)(ol?) you for that. Haha. lol.