how to get annoying people off your back

if you just want to get rid of someone, well you can say i have a really important conversation with someone and it is private sorry!!!! or you could walk away, see when i was younger i would say look over there when they looked i would make a run for it. if a guy you dont like asks you out you can say i already have plans maybe another time!!!!! or the mean way sorry i dont like you now go away.