What do you do if you're getting camped?

Of course bot lane is great to be camped. For junglers, that's snowballing the tower burst (and support, snowballing two people for the price of one lane!). For midlaners, that's a potential double kill (harder against tanky top laners).

To help avoid getting camped, the first step is to ward. If you are the support, sightstone and sweepers helps this. If you are the adc, don't be afraid to grab a pink and maybe a couple vision wards. Try not to push your lane past the midpoint if you're behind. If you're worried about the jungler being able to tower-dive you, make sure you take preventive steps the moment you're behind before it gets to that point.

Play very safe, ward your closest bush along the wall, and the tribush or river bush (you can reach the river bush from above if you're playing top base.) If their mid and jungle are standing in the bush right outside your tower, just stay under tower and be very careful not to get hit with cc. Try to hit minions as much as you can so they cannot easily take the tower with the minion wave.

If your tower is medium to low health, you may want to consider just letting it go; it is better to lose the just tower than to lose you, your lane buddy, your tower and dragon. If you're alive, you still have a chance to contest dragon (if your jungle/mid are readily available to.)

And always try to alert your mid when their jungle and/or mid leave bot lane. Chances are if he isn't there with you, he's pushing mid tower and can easily be caught out.

Edit: Somewhat different from other posts, I don't recommend purchasing pink wards. If they're constantly down in your bushes trying to gank you, they're very likely to find and destroy them. A pink ward behind your tower as top or bottom base may be fine, but don't place it in the tribush or wall-bush, even the river bush may be a bad call. It would be a waste of gold. Regular wards for hot-spots.

Hug dat turret, and use it against them. Some of those people get impatient and they will die to turret unless they overwhelm ya, but if you have a good team they should come to help ya out.

Wards, wards, o an wards. Adc pinks tri, support pinks bush either in river or next to drag. = never get ganked

as said:

1- dont over extend (unnecessarily push) 2- buy wards 3- ask for the jungler to come 4- ensure yor mid lanner doesnt get his lane pushed, becuase that's what allows the enemy mid to roam

Farm your jungle on your way to and from lane. Sacrifice farm for safety. Let them take your turret.