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1.
1) Ridiculous old-school talk which means "Don't say anything". It's right up there with "Pick your feet up", "Pull your socks up", "Hold your horses" and "Sleep tight". These are also phrases which, if taken literally, would be amusing viewing.

2) A cautionary comment to a bloke who may be considering sex with a woman whose disease status is unknown, but looks rife. (Condoms won't help if you're making oral contact with females, kids. They're not magic.) It obviously means "Don't go down on her, you'll get herpes"
1) "My mummy says you're a harlot"
"Hold your tongue, Julia! And pick your feet up!"

2) "Right, I'm leaving now. Guys, this is Kelly"
(gestures to bleach blonde wearing velour tracksuit and giant hoop earrings, chewing gum and smoking at the same time)
"Alright, but Dave? Take this durex and for the love of God, hold your tongue"
by MagickDio April 27, 2010