I know this article comes as a funny coincidence the day after I wrote 'I Like To Fart In Bed', but honestly, one has nothing to do with the other.  Although I'm sure gassing it up in bed is one way to get rid of her...though probably not the best way.

Let's say you've dated for a few months,  it's run its toll and you want out, but how?!  Well you can always ignore her, stop calling and generally avoid her altogether, OR...you can have some decency about you and be upfront with her.  Don't go off cheating on her, don't spread lies or rumors...be a man and let her know you're no longer into her, nor do you want to be.  
But when you do tell her, don't bring up the things you may not like about her or the moment when realized that she wasn't the one.  There's no need to detail the exact reasons you don't like someone.  After all, who the phuck are you to point out her apparent flaws?  What you consider a flaw, someone else may consider endearing.  So don't come down on the poor lamb and start picking her apart.  If she's done something to annoy you, or if you don't like how she dresses or whatever other gay thing she does, just keep it to yourself.  Learn to have some restraint; it'll pay off in the end. 

If you can walk away from someone without making a big scene even after they've pissed you off or hurt you, you'll end up feeling much better about yourself than if you had laid into them about everything stupid little thing they've ever done to irritate you. It's damn near impossible to do, which is probably why you end up feeling so good about yourself. 

But if that doesn't work, go for the jugular and rip them a new one. 

Hey, you tried.