I just heard some lads doing this in a student union and it was very funny, they got louder and louder as they chanted from either side of the bar 
One side: Do you really like it, is it is it wicked
Return: We're lovin it, lovin it, lovin it, we're lovin it like this
One side: Do you really like it, is it is it wicked
Return: We're lovin it, lovin it, lovin it, we're lovin it like that
Would be PROPER lulz
One side: Do you really like it, is it is it wicked
Return: We're lovin it, lovin it, lovin it, we're lovin it like this
One side: Do you really like it, is it is it wicked
Return: We're lovin it, lovin it, lovin it, we're lovin it like that
Would be PROPER lulz