I am in a happy relationship, so when I go to a nightclub with friend(s) I am not looking to pick anyone up, or dance with anyone other than the people/person I came out with.
When I go out to a nightclub, I'll sometimes be 'asked' to dance by a male I do not know. By 'asked' I mean they'll start trying to grind up to me - which I don't appreciate.
On the occasions that my partner is also there, I'll grab him, point to him, and start grinding next to him, which I find is normally enough of a signal to indicate that I'm not interested. Though, I'm not always out with him, so I have tried dancing closer to my friend - even grinding next to them - but with us both being female, this doesn't seem the phase them. I try mouthing no, this doesn't always work, or even shaking my hand in-front of my neck to try and indicate a 'no'. Sometimes I end up pushing them away, more than once as well, before they get the message. I could go get a bouncer, but that could entail leaving my friend, or by the time I reach them, the culprit has disappeared.
I'd like to try and avoid getting physical, i.e. pushing the guy away, as well as having to move though the crowd to find a bouncer if possible.
How could I politely indicate to a guy that I'm not interested in dancing with them?