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1.
to place a letter in a post-box, preferrably with the envelope already franked/stamped and addressed
"how am i gonna contact her?"

"post a letter"
by Starbrick April 15, 2009
 
2.
Man: Hi there!
Woman: Well, Hello.
Man: I hope this isn't too forward of me but would you like to come back to my place and "Post a letter"?
Woman: *gasp *SLAP!!
by VonKillian June 06, 2013