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1.
Good quality food either bought or eaten in an expensive restaurant.
"It's our wedding anniversary so we're going out for some posh nosh at ....".
by Segilla November 11, 2006
 
2.
Nosh being a blow-job, posh nosh is when a girl gives a blow-job but only if the bloke is wearing a condom so that she doesn't get any juice in her mouth/face.
Kyle: Ahh stacies dry, she only gives posh nosh
by Kyleffjfjfjjfjf January 18, 2008