being cocky funny shouldn't really be a routine, it's got to be quick and off the mark. If she says anything that can be turned dirty (in an obvious way) just remark oi OI with a cheeky face
but don't do this if it isn't obvious what you're emplying. You don't want her to have to stand there and be confused cos that'l DLV.
If she's really blonde, neg her about something she's doing, and say "it's alright, you're blonde, i forgive you" - Then put a MASSIVE smile on and laugh. She'll say something like oi! and might hit you....to which you say anything like "careful, i'll get the old bill (do americans say this? - police) on you for sexual harassment" etc etc