How do i lose weight around my thighs and bottom?

squatting. it helps your hamstrings, thighs, and glutes.

so thats what you should do
References :

Everyone has a problem spot. It can be around the stomach, thighs, arms or chest. No matter where your trouble spot is, the solution is exactly the same. You need to eat less and exercise more. The reason why there’s only one solution for all of these problems is because it’s impossible to tell your body where to burn the excess fat from.

When you eat too many calories, your body stores the excess energy as fat in different areas around the body. To lose this fat, you need to create a calorie deficit (eat less than you burn) to force your body to start burning that fat for energy. There is absolutely no way to control where your body goes to find this extra fat.

The larger your calorie deficit (a bigger calorie deficit means a bigger difference between what you eat and what you burn) the faster your body will burn excess fat and the quicker your body fat percentage will start to decrease. You can increase your calorie deficit by cutting your daily intake and exercising more. Sit ups will do nothing to target the fat around your abs just like squats will do nothing to target the fat around your thighs. You can read more about fixing your trouble spots at the Guide to Reducing Body Fat - http://straighthealth.com/pages/guides/reducebodyfat.html
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I’m gonna take a different angle.

You’re asking "HOW". I’m saying that you should be asking "WHY".

Because when your "WHY" is strong enough, you’ll find a way "HOW".

DECIDE
•What do you want?
•Why do you want it? 

DESIRE
•When the “why” becomes clear, the how becomes easier.
•ex. For me, it’s my kids.
 
DOCUMENT
•Set some goals and WRITE THEM DOWN!
•Mail them to a friend. Set up a reminder in your Blackberry.
 
ENVISION
•What does your life look like when these goals are achieved?
•What would you do if you knew you could not fail?
•Make it REAL!

ACT
•This is where 95% of people get stuck.
•Go back to DESIRE. That motivation has to be pure enough to keep you going.
•Take ONE STEP first. (for example, if your goal is building your upper body just start with doing 5 push-ups. Even just drop and do them right now. IN FACT, I did just that! Right now.)

At some point, we all have to dig in and find it in ourselves to live our vision. The size of the vision doesn’t matter. But the person trying to live it (that’s you) sure does.
References :
Lots of experience.
http://www.unflabyourabs.com

squatting is the answer. It will solve your problem.
References :
http://www.fitjudge.com/