(Phrase) Send me correspondance. The origin is most probably from written, where a letter would be "dropped" into the lap of the reciever. It is still used mostly in terms of written communication.
(n.) Sexual maneuvre in which the phallus-bearing party is spread accross a gap approx 3 feet from the floor, with the recieving party(ies) on all fours, legs straightened, being pounded.
Cut the grinnin and drop the linen would be a situation between a man and a woman when they are about to embark on a sexual escapade, but it hasn't quite happened. In those waning moments before it starts, quite possibly over drinks. Then, it's hammer time.