I hear doing it like a rabbit isn't a good thing, I have heard this before and I am just wandering what the hell it means... any ideas?

All it means is having sex all of the time.
Usually every night or more.

There are many variations of this saying, my favorite is "bumping like bunnies"

This comes from the fact that sex is nature's way of making babies, and rabbits typically have lots of offspring. It just means they have sex often, and... yeah.
I had a "rabbit" family next door for a while... xD

Hi, Elousia!

HelpinHere has given you an excellent answer above!

Another way that might help you to understand what it means is that rabbits tend to procreate very rapidly. Much more often than a lot of other creatures.

Thanks!

Usually its quick, and over in a few moments... but often.

From the grapevine, I was told it is having sex very fast as the sole purpose is climaxing. Mostly, men have sex like a rabbit, the "I better get mine before you get yours mentality"!

Go to a farm as watch some rabbits some time... that will answer any questions. Sure there is something on utube.

YA THEgirl that told me that this guy did it like a rabbit, she didn't like he, she said see, its not the size that matters but what you do with it...

Yeah, basically get it in , get it off, get it out, as quickly as possible. He finished up before she even got warmed up.

Yeah, I think its having sex extremely frequently, briefly with anyone and anywhere. In reference to relationships - they have A LOT of sex or engage in sex with other partners (swingers). Offspring are usually a result of this type of behavior.

I had always been under the impression that the bunnyf*** was just very hard and very very fast, like Thumper's leg.

I always thought it was just a general term for sex.

Hard and fast makes sense though!