(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.