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Avid social media users might have noticed that the word 'McChicken' is trending all over the place today.

You can't go on Twitter or Facebook without being reminded of the delicious McDonald's sandwich and wanting a bite of that crispy chicken, lettuce and mayo all lovingly presented in a delicious, soft bun.

Well, you might not be so hungry when you find out the reason it's being talked about... and you definitely shouldn't Google it if you want to keep your lunch down.

See, it turns out that a video of a man having sex a McChicken Sandwich was posted online - and has obviously gone viral because nobody can quite believe it.

Why would someone do such a thing? You'd have to ask the man himself, because we really have no idea.

It has caused no end of confusion, disgust and amusement online though

Most people reacted like this

Even celebrities are talking about it

Actor and director Seth Rogen shared his thoughts on the incident, saying he hopes his new movie Sausage Party has in no way inspired it.

Others hoped their partners didn't get any ideas

Don't worry, Seth. We think you're blameless in all of this.

Some tried to make a joke out of it

But mainly people were horrified

And it left them feeling a bit sick

Vlogger Sky Williams posted a hilarious reaction to the video on his Twitter and YouTube accounts, which has since racked up an impressive 10,000 retweets and 18,000 'likes'.

You can catch his response in the clip above. It's pretty much what everyone is thinking.

One thing's for sure, you're probably safe on Twitter which has been filled up with reaction to the disgusting act, but whatever you do DON'T Google it or you might just stumble across a video you don't want to see.

You have been warned.

Mirror Online has contacted McDonald's about the issue.