Don't get over excited about nothing , similar to don't get your knickers in a twist . Particularly used when someone is over stimulated by a piece of information or occurence . Can be used to express the girliness of a male. Don't get a boner don't get your twat in a knot
Katie : oh my god , nici what are you doing to that cucumber?
Nici: don't get your fanny in a twanny I used protection !

Jose: boo hoo I'm so sad my wife has gone on holiday for 6 weeks I'm so lonely
Ang: don't get your fanny in a twanny you big girl ! Lets go out and get some sluts
by crystal1 June 11, 2013
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